AGREEMENT AND PLAN OF MERGER AND REORGANIZATION




                                      AMONG



                              GRAPHON CORPORATION,

                             GRAPHON VIA SUB I INC.,

                            GRAPHON VIA SUB II INC.,

                            GRAPHON VIA SUB III INC.,

                                 CORTELCO, INC.

                        CIDCO COMMUNICATIONS CORPORATION,

                                       AND

                         SLL COMMUNICATIONS CORPORATION





                                 AUGUST 21, 2002




                                Table of Contents

                                                                            Page


ARTICLE I

DEFINITIONS..................................................................1

  1.1   Acquisition Subsidiaries.............................................1
  1.2   Affiliate............................................................1
  1.3   Affiliated Companies.................................................1
  1.4   Affiliated Company Balance Sheet Date................................1
  1.5   Affiliated Company Contracts.........................................1
  1.6   Affiliated Company Disclosure Schedule...............................1
  1.7   Affiliated Company Financial Statements..............................2
  1.8   Affiliated Company Intellectual Property.............................2
  1.9   Affiliated Company Shares............................................2
  1.10  Agreement............................................................2
  1.11  Acquisition Transactions.............................................2
  1.12  Business Day.........................................................2
  1.13  CIDCO................................................................2
  1.14  CIDCO Certificate of Merger..........................................2
  1.15  CIDCO Conversion Ratio...............................................2
  1.16  CIDCO Effective Time.................................................2
  1.17  CIDCO Financial Statements...........................................2
  1.18  CIDCO Merger.........................................................2
  1.19  CIDCO Options........................................................2
  1.20  CIDCO Shares.........................................................2
  1.21  CIDCO Stock Option Plan..............................................2
  1.22  CIDCO Surviving Corporation..........................................2
  1.23  Closing..............................................................2
  1.24  Closing Date.........................................................2
  1.25  Code.................................................................2
  1.26  Confidential Information.............................................3
  1.27  Contaminant..........................................................3
  1.28  Contract.............................................................3
  1.29  Control..............................................................3
  1.30  Cortelco.............................................................3
  1.31  Cortelco Certificate of Merger.......................................3
  1.32  Cortelco Conversion Ratio............................................3
  1.33  Cortelco Effective Time..............................................3
  1.34  Cortelco Financial Statements........................................4
  1.35  Cortelco Merger......................................................4
  1.36  Cortelco Shares......................................................4
  1.37  Cortelco Surviving Corporation.......................................4
  1.38  CSHC.................................................................4
  1.39  CSHC Shareholders....................................................4
  1.40  Delaware Law.........................................................4
  1.41  Derivative Securities................................................4
  1.42  Disclosing Party.....................................................4
  1.43  Dissenting Shares....................................................4
  1.44  DOL..................................................................4


                                       i


  1.45  Employee Benefit Plan................................................4
  1.46  Employment Agreement.................................................4
  1.47  Encumbrance..........................................................4
  1.48  Environmental Law....................................................5
  1.49  ERISA Affiliate......................................................5
  1.50  ERISA................................................................5
  1.51  Exchange Act.........................................................5
  1.52  Exchange Agent.......................................................5
  1.53  Exchange Fund........................................................5
  1.54  Fairness Opinion.....................................................5
  1.55  Federal Communications Act...........................................5
  1.56  Foothill Capital Credit Agreements...................................5
  1.57  GAAP.................................................................5
  1.58  Governmental Authority...............................................5
  1.59  GraphOn..............................................................5
  1.60  Graphon Balance Sheet Date...........................................5
  1.61  GraphOn Contracts....................................................5
  1.62  GraphOn Disclosure Schedule..........................................5
  1.63  GraphOn Financial Statements.........................................6
  1.64  GraphOn Intellectual Property........................................6
  1.65  GraphOn Shares.......................................................6
  1.66  GraphOn Subsidiary...................................................6
  1.67  GraphOn Subsidiary Shares............................................6
  1.68  Insurance Policy.....................................................6
  1.69  Intellectual Property................................................6
  1.70  IRS..................................................................6
  1.71  Key Employees........................................................6
  1.72  Knowledge............................................................6
  1.73  Law..................................................................6
  1.74  Liability............................................................6
  1.75  Lock-Up Agreement....................................................6
  1.76  Material Adverse Effect..............................................6
  1.77  Merger Shares........................................................7
  1.78  Mergers..............................................................7
  1.79  NASD.................................................................7
  1.80  Nasdaq...............................................................7
  1.81  Parties..............................................................7
  1.82  PBGC.................................................................7
  1.83  Permitted Liens......................................................7
  1.84  Person...............................................................7
  1.85  Personnel Documents..................................................7
  1.86  Potential Acquiror...................................................7
  1.87  Proposals............................................................7
  1.88  Prospectus...........................................................7
  1.89  Proxy Materials......................................................7
  1.90  Receiving Party......................................................7
  1.91  Registration Statement...............................................8


                                       ii


  1.92  Related Party........................................................8
  1.93  Representatives......................................................8
  1.94  Reverse Stock Split..................................................8
  1.95  SEC..................................................................8
  1.96  SEC Reports..........................................................8
  1.97  Securities Act.......................................................8
  1.98  SLL..................................................................8
  1.99  SLL Certificate of Merger............................................8
  1.100 SLL Conversion Ratio.................................................8
  1.101 SLL Effective Time...................................................8
  1.102 SLL Financial Statements.............................................8
  1.103 SLL Merger...........................................................8
  1.104 SLL Shares...........................................................8
  1.105 SLL Surviving Corporation............................................8
  1.106 Special Meeting......................................................8
  1.107 Sub I................................................................8
  1.108 Sub II...............................................................8
  1.109 Sub III..............................................................8
  1.110 Sub IV...............................................................8
  1.111 Subsidiary...........................................................8
  1.112 Tax Returns..........................................................9
  1.113 Taxes................................................................9

ARTICLE II

BASIC TRANSACTIONS...........................................................9

  2.1   Mergers..............................................................9
  2.2   Closing..............................................................9
  2.3   Actions at the Closing...............................................9
  2.4   Effects of Mergers..................................................10
  2.5   Adjustments to Conversion Ratios....................................14
  2.6   Dissenting Shares...................................................14
  2.7   No Fractional Shares................................................15
  2.8   Procedure for Exchange..............................................15
  2.9   Closing of Stock Transfer Records...................................17

ARTICLE III

REPRESENTATIONS AND WARRANTIES OF AFFILIATED COMPANIES......................17

  3.1   Incorporation.......................................................18
  3.2   Foreign Qualification...............................................18
  3.3   Corporate Power and Authority.......................................18
  3.4   Authorization.......................................................18
  3.5   Execution, Delivery, and Enforceability.............................18
  3.6   Capitalization......................................................19


                                       iii


  3.7   Notices, Filings, and Approvals.....................................19
  3.8   Compliance..........................................................19
  3.9   Noncontravention....................................................20
  3.10  Investments.........................................................20
  3.11  Financial Statements................................................20
  3.12  No Undisclosed Liabilities..........................................21
  3.13  Accounting Controls.................................................21
  3.14  Off-Balance-Sheet Transactions......................................21
  3.15  Related-Party Transactions..........................................21
  3.16  Absence of Certain Developments.....................................21
  3.17  Title to, and Sufficiency of, Assets................................24
  3.18  Condition of Assets.................................................24
  3.19  Intellectual Property...............................................24
  3.20  Contracts...........................................................25
  3.21  Taxes...............................................................26
  3.22  Insurance...........................................................27
  3.23  Employment and Labor................................................27
  3.24  Employee Benefit Plans..............................................28
  3.25  Environmental Matters...............................................31
  3.26  Importing and Exporting Activities..................................32
  3.27  Legal Proceedings...................................................33
  3.28  Certain Payments....................................................33
  3.29  No Broker's Commission..............................................33
  3.30  Disclosure..........................................................33

ARTICLE IV

REPRESENTATIONS AND WARRANTIES OF GRAPHON...................................33

  4.1   Incorporation.......................................................34
  4.2   Foreign Qualification...............................................34
  4.3   Corporate Power and Authority.......................................34
  4.4   Authorization.......................................................34
  4.5   Execution, Delivery, and Enforceability.............................34
  4.6   Capitalization......................................................35
  4.7   Notices, Filings, and Approvals.....................................36
  4.8   Compliance..........................................................36
  4.9   Noncontravention....................................................36
  4.10  Investments.........................................................37
  4.11  SEC Reports.........................................................37
  4.12  Financial Statements................................................37
  4.13  No Undisclosed Liabilities..........................................37
  4.14  Accounting Controls.................................................37
  4.15  Off-Balance-Sheet Transactions......................................38
  4.16  Related-Party Transactions..........................................38
  4.17  Absence of Certain Developments.....................................38
  4.18  Title to, and Sufficiency of, Assets................................40


                                       iv


  4.19  Condition of Assets.................................................41
  4.20  Intellectual Property...............................................41
  4.21  Contracts...........................................................41
  4.22  Taxes...............................................................43
  4.23  Insurance...........................................................43
  4.24  Employment and Labor................................................44
  4.25  Employee Benefit Plans..............................................44
  4.26  Environmental Matters...............................................47
  4.27  Legal Proceedings...................................................48
  4.28  Certain Payments....................................................49
  4.29  No Broker's Commission..............................................49
  4.30  Disclosure..........................................................49

ARTICLE V

PRE-CLOSING COVENANTS.......................................................49

  5.1   Conduct of Business.................................................49
  5.2   Access..............................................................50
  5.3   Notices, Filings, and Approvals.....................................50
  5.4   Registration Statement and Proxy Statement/Prospectus...............50
  5.5   Fairness Opinion....................................................51
  5.6   Special Meeting.....................................................51
  5.7   Reverse Stock Split.................................................51
  5.8   Nasdaq Initial Listing..............................................51
  5.9   Board of Directors of GraphOn.......................................52
  5.10  Employment Agreements...............................................52
  5.11  Lock-Up Agreements..................................................52
  5.12  Additional Funding..................................................52
  5.13  Transfer of GraphOn's Assets and Liabilities........................52
  5.14  Distribution of Shares of Cortelco..................................52
  5.15  Non-Solicitation....................................................53
  5.16  Representations and Warranties; Covenants...........................53
  5.17  Notice of Adverse Developments......................................53
  5.18  General.............................................................53

ARTICLE VI

CONDITIONS TO OBLIGATIONS TO CLOSE..........................................54

  6.1   Conditions to Obligation of GraphOn.................................54
  6.2   Conditions to Obligations of the Affiliated Companies...............55

ARTICLE VII

POST-CLOSING MATTERS........................................................57

                                       v


  7.1   Further Assurances..................................................57
  7.2   Filling Vacancies on Board of Directors of GraphOn..................57

ARTICLE VIII

TERMINATION.................................................................57

  8.1   Termination of Agreement............................................57
  8.2   Effect of Termination...............................................58

ARTICLE IX

MISCELLANEOUS...............................................................58

  9.1   Confidentiality.....................................................58
  9.2   Fees and Expenses...................................................59
  9.3   Public Disclosures..................................................59
  9.4   Entire Agreement....................................................60
  9.5   Notices.............................................................60
  9.6   Enforceability......................................................61
  9.7   Assignment..........................................................61
  9.8   Amendments..........................................................61
  9.9   Waiver..............................................................61
  9.10  Modification and Severability.......................................61
  9.11  Headings............................................................61
  9.12  Construction........................................................61
  9.13  Governing Law.......................................................62
  9.14  Multiple Counterparts...............................................62


SCHEDULES

   Affiliated Company Disclosure Schedule
   GraphOn Disclosure Schedule
   Schedule 2.4(a)(iv) - Directors and Officers of Cortelco Surviving
   Corporation Schedule 2.4(b)(iv) - Directors and Officers of CIDCO Surviving
   Corporation Schedule 2.4(c)(iv) - Directors and Officers of SLL Surviving
   Corporation Schedule 5.10 - Parties to Employment Agreements Schedule 5.11 -
   Parties to Lock-Up Agreements Schedule 7.2 - Persons Designated by the
   Affiliated Companies to Fill Vacancies on Board of Directors of GraphOn

EXHIBITS

   Exhibit A  -   Cortelco Certificate of Merger
   Exhibit B  -   CIDCO Certificate of Merger
   Exhibit C  -   SLL Certificate of Merger


                                       vi


   Exhibit D  -   Employment Agreement
   Exhibit E  -   Form of Lock-Up Agreement
   Exhibit F  -   Legal Opinion of Baker, Donelson, Bearman & Caldwell
   Exhibit G  -   Legal Opinion of Sonnenschein Nath & Rosenthal





GraphOn Corporation agrees to furnish supplementally to the Securities and
Exchange Commission (the "SEC") a copy of the above listed schedules and
exhibits upon request by the SEC.





                                       vii


      AGREEMENT AND PLAN OF MERGER AND REORGANIZATION dated as of August 21,
2002, by and among GraphOn Corporation, a Delaware corporation ("GraphOn"),
GraphOn Via Sub I Inc., a Delaware corporation ("Sub I"), GraphOn Via Sub II
Inc., a Delaware corporation ("Sub II"), GraphOn Via Sub III Inc., a Delaware
corporation ("Sub III"), Cortelco, Inc., a Delaware corporation ("Cortelco"),
CIDCO Communications Corporation, a Delaware corporation ("CIDCO"), and SLL
Communications Corporation, a Delaware corporation ("SLL"). Sub I, Sub II, and
Sub III are referred to collectively herein as the "Acquisition Subsidiaries."
Cortelco, CIDCO, and SLL are referred to collectively herein as the "Affiliated
Companies." GraphOn, the Acquisition Subsidiaries, and the Affiliated Companies
are referred to collectively herein as the "Parties."

                                  INTRODUCTION

      GraphOn is a publicly held company whose common stock is traded on Nasdaq.
GraphOn is engaged in the business of developing and selling business
connectivity software. The Acquisition Subsidiaries are wholly owned
subsidiaries of GraphOn that have been formed for the sole purpose of acquiring
the Affiliated Companies and have not been, and are not, engaged in any other
business activity. The Affiliated Companies are privately held companies that
are engaged in the telecommunications business.

      The Parties have determined that it is desirable and in their respective
best interests and the best interests of their respective stockholders for Sub I
to merge with and into Cortelco, Sub II to merge with and into CIDCO, and Sub
III to merge with and into SLL, each in a statutory merger in accordance with
Delaware Law, and all on the terms and subject to the conditions of this
Agreement.

      Based on the foregoing, and in consideration of the mutual benefits to be
derived hereby and the mutual representations, warranties, agreements, and
covenants contained herein, the Parties agree as follows.

ARTICLE I

                                   DEFINITIONS

      For purposes of this Agreement, the terms defined in this Article I shall
have the meanings assigned to them in this Article I and shall include the
plural as well as the singular versions of such terms.

1.1   Acquisition Subsidiaries.  As defined in the preface of this Agreement.

1.2 Affiliate. Any Person that directly, or indirectly through one or more
intermediaries, Controls, is Controlled by, or is under common Control with,
another Person.

1.3   Affiliated Companies.  As defined in the preface of this Agreement.

1.4   Affiliated Company Balance Sheet Date.  As defined in Section 3.16 of
this Agreement.

1.5   Affiliated  Company  Contracts.  As  defined  in  Section  3.20  of this
Agreement.

1.6 Affiliated Company Disclosure Schedule. The disclosure schedule prepared by
the Affiliated Companies and arranged in sections corresponding to the section





numbers of the representations and warranties made by the Affiliated Companies
in Article III of this Agreement.

1.7   Affiliated Company Financial  Statements.  As defined in Section 3.11 of
this Agreement.

1.8   Affiliated   Company   Intellectual   Property.   All  the  Intellectual
Property owned or used by the Affiliated Company.

1.9   Affiliated  Company  Shares.  As  defined  in  Section  3.6(a)  of  this
Agreement.

1.10 Agreement. This Agreement and Plan of Merger and Reorganization dated as of
August 21, 2002, by and among the Parties, including all exhibits and schedules
hereto, as the same may from time to time be amended or supplemented by one or
more instruments executed by the Parties.

1.11  Acquisition Transactions.  As defined in Section 5.14 of this Agreement.

1.12  Business  Day.  Any day except a Saturday,  a Sunday or any other day on
which  commercial  banks are required or authorized to close in New York,  New
York.

1.13  CIDCO.   As defined in the preface of this Agreement.

1.14  CIDCO  Certificate  of  Merger.  As  defined  in  Section  2.3  of  this
Agreement.

1.15  CIDCO  Conversion  Ratio.  As  defined  in  Section  2.4(b)(v)  of  this
Agreement.

1.16  CIDCO  Effective   Time.  As  defined  in  Section   2.4(b)(i)  of  this
Agreement.

1.17  CIDCO  Financial  Statements.   As  defined  in  Section  3.11  of  this
Agreement.

1.18  CIDCO Merger.  As defined in Section 2.1 of this Agreement.

1.19  CIDCO Options.  As defined in Section 2.4(b)(vii) of this Agreement.

1.20  CIDCO Shares.  As defined in Section 3.6(a) of this Agreement.

1.21  CIDCO Stock Option  Plan.  The CIDCO Equity  Incentive  Plan,  effective
January 25, 2002.

1.22  CIDCO  Surviving  Corporation.   As  defined  in  Section  2.1  of  this
Agreement.

1.23  Closing.  As defined in Section 2.2 of this Agreement.

1.24  Closing Date.  As defined in Section 2.2 of this Agreement.

1.25  Code.  The  Internal   Revenue  Code  of  1986,  as  amended,   and  the
regulations, rulings, and forms issued thereunder.

                                       2


1.26 Confidential Information. (a) All information that the Disclosing Party and
its Representatives furnish to the Receiving Party and its Representatives
before or after the date of this Agreement, whether prepared by or on behalf of
the Disclosing Party, its Representatives or otherwise, and whether transmitted
orally, in writing, electronically, or otherwise, in connection with the
transactions contemplated by this Agreement, and (b) all analyses, compilations,
forecasts, memoranda, notes, studies, and other information prepared by or on
behalf of the Receiving Party and its Representatives that contain or otherwise
reflect any such information of the Disclosing Party or the Receiving Party's or
any of its Representatives' review and/or evaluation thereof; provided, however,
that "Confidential Information" does not include information that (A) is or
becomes generally available to the public other than as a result of actions by
the Receiving Party or its Representatives in violation of this Agreement, (B)
is or becomes available to the Receiving Party or its Representatives on a
non-confidential basis from a source other than the Disclosing Party or its
Representatives that is not prohibited from disclosing such information to the
Receiving Party or its Representatives by a legal, contractual, fiduciary, or
other obligation to the Disclosing Party or any other Person, or (C) was in the
possession of the Receiving Party or its Representatives prior to such
information being furnished to the Receiving Party by or on behalf of the
Disclosing Party.

1.27 Contaminant. (a) Any hazardous substance, within the meaning of that term
under the Comprehensive Environmental Response, Compensation and Liability Act
of 1980, as amended, and any implementing regulations thereunder; (b) any
hazardous or toxic substance, waste or material within the meaning of any other
Environmental Laws applicable to the Parties; (c) any pollutant, contaminant or
special waste; or (d) any petroleum, crude oil or any fraction thereof.

1.28 Contract. Any agreement, contract, commitment, undertaking, instrument,
obligation, purchase order, sale order, license, franchise agreement,
distributor agreement, supplier agreement, dealer agreement, sales
representative agreement, agency agreement, operating agreement, joint venture
agreement, lease, employment agreement, consulting agreement, non-competition
agreement, loan agreement, credit agreement, promissory note, indenture, letter
of credit, evidence of indebtedness, security or pledge agreement, course of
dealing or practice, or other arrangement, whether written or oral, to which a
Person is a party or is otherwise bound.

1.29 Control. The possession, direct or indirect, of the power to direct or
cause the direction of the management and policies of a Person, whether through
the ownership of voting securities, by contract, or otherwise. "Controlling" and
"Controlled" have meanings correlative thereto.

1.30  Cortelco.  As defined in the preface of this Agreement.

1.31  Cortelco  Certificate  of Merger.  As  defined  in  Section  2.3 of this
Agreement.

1.32  Cortelco  Conversion  Ratio.  As defined in  Section  2.4(a)(v)  of this
Agreement.

1.33  Cortelco  Effective  Time.  As  defined  in  Section  2.4(a)(i)  of this
Agreement.

                                       3


1.34  Cortelco  Financial  Statements.  As  defined  in  Section  3.11 of this
Agreement.

1.35  Cortelco Merger.  As defined in Section 2.1 of this Agreement.

1.36  Cortelco Shares.  As defined in Section 3.6(a) of this Agreement.

1.37  Cortelco  Surviving  Corporation.  As  defined  in  Section  2.1 of this
Agreement.

1.38  CSHC.  As defined in Section 5.14 of this Agreement.

1.39  CSHC Stockholders.  As defined in Section 5.14 of this Agreement.

1.40  Delaware Law. The General  Corporation Law of the State of Delaware,  as
amended.

1.41 Derivative Securities. Options, warrants, rights, shares of capital stock,
evidence of indebtedness, or other securities that are convertible into or
exercisable or exchangeable for shares of common stock.

1.42  Disclosing Party.  As defined in Section 9.1(a) of this Agreement.

1.43  Dissenting Shares.  As defined in Section 2.6 of this Agreement.

1.44  DOL.  The Department of Labor of the United States Government.

1.45 Employee Benefit Plan. Any "employee benefit plan" within the meaning of
Section 3(3) of ERISA, any "specified fringe benefit plan" within the meaning of
Section 6039D of the Code, and any other bonus, incentive compensation,
profit-sharing, equity, stock bonus, stock option, stock appreciation rights,
restricted stock, other stock-based incentive, executive compensation agreement,
employment agreement, consulting agreement, deferred compensation, pension,
stock purchase, employee stock ownership, savings, pension, retirement,
supplemental retirement, change-in-control, severance, salary continuation,
layoff, welfare (including, without limitation, health, medical, prescription,
dental, disability, salary continuation, life, accidental death, travel
accident, and other insurance), vacation, holiday, sick leave, fringe benefit,
or other benefit plan, program, or policy, whether written or oral, and whether
qualified or nonqualified, and any trust, escrow, or other agreement related
thereto, covering any present or former employees, directors or their respective
dependents.

1.46  Employment Agreement.  As defined in Section 5.10 of this Agreement..

1.47 Encumbrance. Any claim, right, lien (statutory or otherwise),
hypothecation, pledge, security interest, mortgage, deed of trust, option,
charge, assessment, covenant, restriction, easement, right-of-way, encroachment,
building or use restriction, defect in title, conditional or contingent sales
agreement, title retention agreement, charge, encumbrance, or other burden or
conflicting interest of any kind or nature, whether voluntarily incurred or
arising by operation of Law, including, without limitation, any agreement or
commitment to provide for any of the foregoing in the future.

                                       4


1.48 Environmental Law. Any local, state or federal Law, common law duty,
permit, license, authorization, order, decision or other binding determination
pertaining to Contaminants, the environment, environmental media, natural
resources, contamination, clean-up or disclosure, air, surface water, drinking
water, groundwater, landfills, open dumps, storage tanks (underground or
otherwise), waste, waste water, storm water run-off, emissions, releases, noise,
toxic substances or wells, and human health and safety.

1.49 ERISA Affiliate. Any other entity (whether or not incorporated) which is or
was, together with any Affiliated Company, or GraphOn as applicable, treated as
a single employer under Section 414(b), (c), (m) or (o) of the Internal Revenue
Code of 1986, as amended ("Code").

1.50 ERISA. The Employee Retirement Income Security Act of 1974, as amended, and
the rules, regulations, and forms issued thereunder.

1.51  Exchange Act. The Securities  Exchange Act of 1934, as amended,  and the
rules, regulations, and forms issued thereunder.

1.52  Exchange Agent.  As defined in Section 2.8(a) of this Agreement.

1.53  Exchange Fund.  As defined in Section 2.8(a) of this Agreement.

1.54  Fairness Opinion.  As defined in Section 5.5 of this Agreement.

1.55  Federal Communications Act.  As defined in Section 3.8 of this
Agreement.

1.56 Foothill Capital Credit Agreements. The $10.0 million Amended and Restated
Loan and Security Agreement dated as of December 31, 2001 among CIDCO, Cortelco,
and Foothill Capital Corporation, and the $10.0 Million Loan and Security
Agreement between Cortelco and Foothill Capital Corporation dated as of July 31,
1997, and the documents ancillary thereto, as each of the same have been or may
be amended, modified, renewed, refunded, replaced, or refinanced from time to
time.

1.57  GAAP.  Generally accepted  accounting  principles as in effect from time
to time in the United States of America.

1.58  Governmental   Authority.   Any  federal,   state,  county,   municipal,
foreign,   or  other   government  or  political   subdivision,   agency,   or
instrumentality thereof.

1.59  GraphOn.  As defined in the preface of this Agreement.

1.60  Graphon Balance Sheet Date.  As defined in Section 4.17 of this
Agreement.

1.61  GraphOn Contracts.  As defined in Section 4.21 of this Agreement.

1.62 GraphOn Disclosure Schedule. The disclosure schedule prepared by GraphOn
and arranged in sections corresponding to the section numbers of the
representations and warranties made by GraphOn in Article IV of this Agreement.

                                       5


1.63  GraphOn  Financial  Statements.  As  defined  in  Section  4.12  of this
Agreement.

1.64  GraphOn Intellectual  Property.  All the Intellectual  Property owned or
used by GraphOn.

1.65  GraphOn Shares.  As defined in Section 4.6(a) of this Agreement.

1.66  GraphOn Subsidiary.  A Subsidiary of GraphOn.

1.67  GraphOn  Subsidiary  Shares.  As  defined  in  Section  4.6(b)  of  this
Agreement.

1.68 Insurance Policy. Any commercial, general liability, errors and omissions,
property, casualty, business interruption, products liability, environmental,
automobile, directors and officers, medical, prescription, dental, disability,
salary continuation, life, accidental death, travel accident, umbrella or other
insurance policy, binder therefor, or endorsement thereto.

1.69 Intellectual Property. Patents and pending patent applications, copyrights
and pending applications for copyright registration, trademarks and pending
applications for trademark registration, trade names, trade dress, logos,
licenses, discoveries, inventions, trade secrets, know-how, and other
intellection property.

1.70  IRS.  The Internal Revenue Service of the United Stated Government.

1.71  Key Employees.  As defined in Section 5.10 of this Agreement.

1.72 Knowledge. With respect to a particular matter, the actual knowledge of the
executive officers of the Party after reasonable inquiry of appropriate
personnel or Representatives, or consultation of the books and records of the
Party.

1.73 Law. Any federal, state, local or foreign law, statute, ordinance, rule,
regulation, judgment, order, injunction, decree, arbitration award, agency
requirement, license, or permit of, or agreement or written understanding with,
any Governmental Authority.

1.74 Liability. Any direct or indirect obligation, indebtedness, commitment,
expense, claim, deficiency, guaranty, endorsement or other liability of any
kind, whether known or unknown, direct or indirect, accrued or unaccrued,
absolute or contingent, disputed or undisputed or otherwise, and whether or not
the same is required to be accrued on financial statements.

1.75  Lock-Up Agreement.  An defined in Section 5.11 of this Agreement.

1.76 Material Adverse Effect. Any state of facts, change, event, or effect that
individually or together with other states of facts, changes, events, or
effects, is materially adverse to the business, operations, assets, properties,
prospects, or condition (financial or otherwise) of a Party or would impair the
ability of any Party to consummate the transactions contemplated by this
Agreement, regardless of whether such material adverse effect arises in the
ordinary course of business; provided, however, that none of the following shall
be considered a Material Adverse Effect: (a) any state of facts, change, event,
or effect arising from or relating to general business or economic conditions
(including prevailing interest rates and stock market levels or general market


                                       6


disruptions); (b) any state of facts, change, event, or effect arising from or
relating to the general state of the industry and market sectors in which the
Party operates, except, in the case of the Affiliated Companies, to the extent
such state of facts, change, event, or effect has a disproportionate effect on
the Affiliated Companies individually or taken as a whole, and (c) in the case
of Graphon, any change in the market price of Graphon Shares after the date
hereof.

1.77  Merger Shares.  As defined in Section 2.3 of this Agreement.

1.78  Mergers.  As defined in Section 2.1 of this Agreement.

1.79  NASD.  The National Association of Securities Dealers, Inc.

1.80  Nasdaq.  The Nasdaq SmallCap Market.

1.81  Parties.  As defined in the preface to this Agreement.

1.82  PBGC.  The Pension  Benefit  Guaranty  Corporation  of the United States
Government.

1.83 Permitted Liens. Any and all (a) liens for Taxes, assessments, and charges
of a Governmental Authority not yet due and payable, (b) mechanic's,
materialmen's, warehousemen's, or carriers' liens for sums not yet due and
payable, (c) liens incurred in connection with workers' compensation,
unemployment insurance, and other types of social security, (d) purchase money
security interests and other liens held by equipment lessors in leased
equipment, (e) in the case of any leased asset, (i) the rights of any lessor
under the applicable lease agreement or any lien granted by any lessor and (ii)
any statutory lien for amounts not yet due and payable or that are being
contested in good faith, (f) other liens arising in the ordinary course of
business and not incurred in connection with the borrowing of money, and (g)
liens that do not, individually or in the aggregate, detract from or interfere
with any use of or impair the value of any asset as currently used.

1.84 Person. Any natural person, company, corporation, professional corporation,
general partnership, limited partnership, limited liability company, limited
liability partnership, joint venture, trust, land trust, business trust, or
other association or organization, regardless of whether it is a legal entity,
or any Governmental Authority.

1.85  Personnel Documents.  As defined in Section 3.24(a) of this Agreement.

1.86  Potential Acquiror.  As defined in Section 5.15 of this Agreement.

1.87  Proposals.  As defined in Section 5.6 of this Agreement.

1.88  Prospectus.  As defined in Section 5.4 of this Agreement.

1.89  Proxy Materials.  As defined in Section 5.4 of this Agreement.

1.90  Receiving Party.  As defined in Section 9.1(a) of this Agreement.

                                       7


1.91 Registration Statement. As defined in Section 5.4 of this Agreement. 1.92
Related Party. Any present or former stockholder, director, officer, or employee
of a Party, any family member of such stockholder, director, officer, or
employee, or any other Person in which any such stockholder, director, officer,
employee, or family member owns of record or beneficially any capital stock or
other securities or any other equity or proprietary interest.

1.93 Representatives. As to any Party, the directors, officers, employees,
agents, contractors, attorneys, accountants, advisors, and other representatives
of such Person.

1.94  Reverse Stock Split.  As defined in Section 5.7 of this Agreement

1.95  SEC.  The Securities and Exchange Commission.

1.96  SEC Reports.  As defined in Section 4.11 of this Agreement.

1.97  Securities  Act. The Securities Act of 1933, as amended,  and the rules,
regulations, and forms issued thereunder.

1.98  SLL.  As defined in the preface of this Agreement.

1.99  SLL Certificate of Merger.  As defined in Section 2.3 of this Agreement.

1.100 SLL  Conversion   Ratio.  As  defined  in  Section   2.4(c)(v)  of  this
Agreement.

1.101 SLL Effective Time.  As defined in Section 2.4(c)(i) of this Agreement.

1.102 SLL Financial Statements.  As defined in Section 3.11 of this Agreement.

1.103 SLL Merger.  As defined in Section 2.1 of this Agreement.

1.104 SLL Shares.  As defined in Section 3.6(a) of this Agreement.

1.105 SLL Surviving Corporation.  As defined in Section 2.1 of this Agreement.

1.106 Special Meeting.  As defined in Section 5.6 of this Agreement.

1.107 Sub I.  As defined in the preface of this Agreement.

1.108 Sub II.  As defined in the preface of this Agreement.

1.109 Sub III.  As defined in the preface of this Agreement.

1.110 Sub IV.  As defined in Section 4.6(b) of this Agreement.

1.111 Subsidiary. As to any Person, any Affiliate that is controlled by such
Person directly or indirectly through one or more intermediaries.

                                       8


1.112 Tax Returns. All returns,  declarations,  reports, statements, and other
documents required to be filed in respect of Taxes.

1.113 Taxes. All federal, state, county, municipal, foreign, and other net
income, gross income, gross receipts, profits, capital gains, sales, use,
value-added, ad valorem, transfer, franchise, license, lease, service,
withholding, payroll, employment (including Social Security and Medicare),
excise, severance, golden parachute, property, stamp, customs, or other taxes,
fees, assessments, duties, impositions, or charges of any kind whatsoever,
together with all interest, penalties, additions to tax, and additional amounts
with respect thereto.

ARTICLE II

                               BASIC TRANSACTIONS

2.1 Mergers. On the terms and subject to the conditions of this Agreement, Sub I
shall merge with and into Cortelco (the "Cortelco Merger") at the Cortelco
Effective Time, Sub II shall merge with and into CIDCO (the "CIDCO Merger") at
the CIDCO Effective Time, and Sub III shall merge with and into SLL (the "SLL
Merger") at the SLL Effective Time. The Cortelco Merger, the CIDCO Merger, and
the SLL Merger are referred to collectively herein as the "Mergers." Cortelco
shall be the corporation surviving the Cortelco Merger (the "Cortelco Surviving
Corporation"); CIDCO shall be the corporation surviving the CIDCO Merger (the
"CIDCO Surviving Corporation"); and SLL shall be the corporation surviving the
SLL Merger (the "SLL Surviving Corporation"). It is intended by the Parties that
the Mergers shall constitute tax-free reorganizations within the meaning of
Section 368 of the Code and that this Agreement shall constitute a plan of
reorganization within the meaning of the regulations thereunder.

2.2 Closing. The closing of the transactions contemplated by this Agreement (the
"Closing") shall occur by telephone with deliveries of Closing documents by
overnight courier, or in person at a mutually convenient location, or by such
other method as shall be mutually agreeable to the Parties. Any executed Closing
documents sent by a Party or its counsel to the other Party or its counsel prior
to the Closing shall be held in escrow by such other Party or its counsel until
such executed documents are authorized to be released and delivered by an
executive officer of the sending Party or by the sending Party's counsel. The
Closing shall occur at 9:00 a.m. (Pacific time) on the second Business Day
following the satisfaction or waiver of all conditions to the obligations of the
Parties to consummate the transactions contemplated hereby (other than
conditions with respect to actions that the respective Parties will take at the
Closing itself) or such other date as the Parties may mutually determine (the
"Closing Date").

2.3 Actions at the Closing. At the Closing, (a) the Affiliated Companies shall
deliver to GraphOn the various documents, instruments, and certificates referred
to in Section 6.1 hereof, (b) GraphOn and the Acquisition Subsidiaries shall
deliver to the Affiliated Companies the various documents, instruments, and
certificates referred to in Section 6.2 hereof, (c) a certificate of merger
setting forth the terms of the Cortelco Merger shall be filed with the office of
the Secretary of State of the State of Delaware in the form attached hereto as
Exhibit A (the "Cortelco Certificate of Merger"), (d) a certificate of merger
setting forth the terms of the CIDCO Merger shall be filed with the office of
the Secretary of State of the State of Delaware in the form attached hereto as
Exhibit B (the "CIDCO Certificate of Merger"), (e) a certificate of merger


                                       9


setting forth the terms of the SLL Merger shall be filed with the office of the
Secretary of State of the State of Delaware in the form attached hereto as
Exhibit C (the "SLL Certificate of Merger"), and (f) GraphOn shall deliver to
the Exchange Agent certificates evidencing the total number of GraphOn Shares to
be issued pursuant to the Mergers (the "Merger Shares") in the manner provided
in Section 2.8(a) hereof.

2.4   Effects of Mergers.
      ------------------

(a)   Cortelco Merger.
      ----------------

(i)   The  Cortelco  Merger  shall  become  effective at the time the Cortelco
      Certificate  of Merger is filed with the Secretary of State of the State
      of  Delaware  or such  later  time as is  specified  in the Cortelco
      Certificate of Merger (the "Cortelco  Effective  Time").  The  Cortelco
      Merger  shall  have the  effects  set  forth in the Delaware  law.  The
      Cortelco  Surviving  Corporation  may, at any time  after  the  Cortelco
      Effective   Time,   take  any  action (including  executing and delivering
      any document) in the name and on behalf of  either  Cortelco  or Sub I in
      order to carry out and effectuate the transactions contemplated by this
      Agreement.

(ii)  The certificate of incorporation of Cortelco in effect at and as of the
      Cortelco Effective Time shall remain the certificate of incorporation of
      the Cortelco Surviving Corporation without any modification or amendment
      in the Cortelco Merger.

(iii) The bylaws of Cortelco in effect at and as of the Cortelco Effective Time
      shall remain the bylaws of the Cortelco Surviving Corporation without any
      modification or amendment in the Cortelco Merger.

(iv)  The directors and officers of the Cortelco Surviving Corporation shall be
      the individuals listed on Schedule 2.4(a)(iv) hereto.

(v)   At and as of the  Cortelco  Effective  Time,  (a)  each  Cortelco  Share
      (other  than  any  Dissenting   Shares)  issued  and   outstanding
      immediately prior to the Cortelco  Effective Time shall, by virtue of the
      Cortelco  Merger and without any action on the part of the holder thereof,
      be converted  into the right to receive  .417708 GraphOn  Shares (the
      ratio  of  .417708  GraphOn  Shares  to one Cortelco  Share is referred to
      herein as the "Cortelco  Conversion Ratio"), subject to  rounding  up to
      the  nearest  whole  GraphOn Share in lieu of the issuance of fractional
      shares as provided in Section 2.7  hereof,  and the right to receive  any
      dividends  or distributions  thereon from and after the Cortelco Effective
      Date, and (b) each  Dissenting  Share shall be converted  into the right
      to receive payment from the Cortelco  Surviving  Corporation  with respect
      thereto in accordance  with Section 2.6 hereof;  provided, however, that
      the Cortelco  Conversion  Ratio shall be subject to equitable adjustment
      in the event of any stock issuance, stock split, stock dividend, reverse
      stock split, or other change in the number of GraphOn Shares or Cortelco


                                       10


      Shares outstanding prior to the Cortelco Effective Time (other than the
      Reverse Stock Split).

(vi)  At and as of the Cortelco Effective Time, each Cortelco Share held in
      treasury by Cortelco immediately prior to the Cortelco Effective Time
      shall, by virtue of the Cortelco Merger and without any action on the part
      of Cortelco, be canceled and retired, and no GraphOn Shares or other
      shares of capital stock or securities of GraphOn or Sub I shall be
      issuable with respect thereto.

(vii) At and as of the Cortelco Effective Time, each share of common stock of
      Sub I issued and outstanding immediately prior to the Cortelco Effective
      Time shall, by virtue of the Cortelco Merger and without any action on the
      part of GraphOn, be converted into and become one fully paid and
      nonassessable share of common stock of the Cortelco Surviving Corporation
      and shall constitute the only outstanding shares of capital stock of the
      Cortelco Surviving Corporation. No shares of capital stock of Sub I shall
      be deemed to be outstanding or to have any rights after the Cortelco
      Effective Time.

(viii)GraphOn Shares. Each GraphOn Share issued and outstanding at and as of the
      Cortelco Effective Time shall remain issued and outstanding following the
      Cortelco Effective Time.

(b)   CIDCO Merger.
      ------------

(i)   The  CIDCO  Merger  shall  become   effective  at  the  time  the  CIDCO
      Certificate  of Merger is filed with the Secretary of State of the State
      of Delaware or such later time as is  specified in the CIDCO Certificate
      of Merger (the  "CIDCO  Effective  Time").  The CIDCO Merger shall have
      the effects set forth in the  Delaware  Law. The CIDCO  Surviving
      Corporation  may,  at any time  after  the CIDCO Effective Time, take any
      action (including executing and delivering  any  document) in the name and
      on behalf of either CIDCO  or  Sub  II in  order  to  carry  out  and
      effectuate  the transactions contemplated by this Agreement.

(ii)  The certificate of incorporation of CIDCO in effect at and as of the CIDCO
      Effective Time shall remain the certificate of incorporation of the CIDCO
      Surviving Corporation without any modification or amendment in the CIDCO
      Merger.

(iii) The bylaws of CIDCO in effect at and as of the CIDCO Effective Time shall
      remain the bylaws of the CIDCO Surviving Corporation without any
      modification or amendment in the CIDCO Merger.

(iv)  The directors and officers of the CIDCO Surviving Corporation shall be the
      individuals listed on Schedule 2.4(b)(iv) hereto.

                                       11


(v)   At and as of the CIDCO  Effective Time, (a) each CIDCO Share (other than
      any Dissenting Share) issued and outstanding  immediately prior to the
      CIDCO  Effective Time shall, by virtue of the CIDCO Merger and without any
      action on the part of the holder thereof,  be canceled and converted
      into the right to receive  1.564480  GraphOn Shares (the  ratio of
      1.564480  GraphOn  Shares  to one  CIDCO  Share is referred to herein as
      the "CIDCO  Conversion  Ratio"),  subject to rounding  up to the  nearest
      whole  GraphOn  Share in lieu of the issuance of  fractional  shares as
      provided in Section 2.7 hereof, and the right to receive any  dividends or
      distributions  thereon after  the  CIDCO  Effective  Date and (b) each
      Dissenting  Share shall be  converted  into the right to  receive  payment
      from the CIDCO  Surviving  Corporation  with respect  thereto in
      accordance with  Section  2.6  hereof;  provided,  however,  that  the
      CIDCO Conversion  Ratio shall be subject to equitable  adjustment in the
      event of any stock issuance, stock split, stock dividend,  reverse stock
      split, or other  change in the number of GraphOn  Shares or CIDCO Shares
      outstanding prior to the CIDCO Effective Time (other than the Reverse
      Stock Split).

(vi)  At and as of the CIDCO Effective Time, each CIDCO Share held in treasury
      by CIDCO immediately prior to the CIDCO Effective Time shall, by virtue of
      the CIDCO Merger and without any action on the part of CIDCO, be canceled
      and retired, and no GraphOn Shares or other shares of capital stock or
      securities of GraphOn or Sub II shall be issuable with respect thereto.

(vii) All options to purchase CIDCO Shares (the "CIDCO Options") that are
      outstanding and unexercised at the CIDCO Effective Time, regardless of
      whether they are vested or exercisable, shall remain outstanding
      following the CIDCO Effective Time. At and as of the CIDCO Effective Time,
      the CIDCO Options shall, by virtue of the CIDCO Merger and without any
      further action on the part of CIDCO or the holders thereof, be assumed by
      GraphOn in such manner consistent with a corporation "assuming a stock
      option in a transaction to which Section 424(a) applies" within the
      meaning of Section 424 of the Code. To the extent that Section 424 of the
      Code does not apply to any such CIDCO Options, GraphOn shall assume the
      CIDCO Options in such a manner as if Section 424 of the Code applied to
      such CIDCO Options. Each CIDCO Option assumed by GraphOn shall be
      exercisable upon the same terms and conditions as set forth in the CIDCO
      Stock Option Plan and the stock option agreement pursuant to which such
      CIDCO Option was granted, except that (A) such CIDCO Option shall be
      exercisable for that whole number of GraphOn Shares (rounded down to the
      nearest whole share) into which the number of CIDCO Shares subject to such
      CIDCO Option immediately prior to the CIDCO Effective Time would be
      converted upon application of a conversion ratio of 2.61333 (the "Stock
      Option Conversion Ratio"), and (B) the option exercise price per GraphOn
      Share shall be an amount equal to the option exercise price per CIDCO
      Share under such CIDCO Option in effect immediately prior to the CIDCO
      Effective Time divided by the number of full GraphOn Shares deemed


                                       12


      purchasable pursuant to such CIDCO Option in accordance with the foregoing
      (the option exercise price per share, as so determined, being rounded up
      to the nearest full cent); provided, however, that the Stock Option Ratio
      shall be subject to equitable adjustment in the event of any stock
      issuance, stock split, stock dividend, reverse stock split, or other
      change in the number of GraphOn Shares, SLL Shares, or CIDCO Shares
      outstanding prior to the CIDCO Effective Time (other than the Reverse
      Stock Split).

(viii)At and as of the CIDCO  Effective Time, each share of common stock of Sub
      II issued and  outstanding  immediately  prior to the CIDCO Effective Time
      shall,  by virtue of the CIDCO  Merger and without any action on the part
      of GraphOn, be converted into and become one fully paid and nonassessable
      share of  common  stock of the CIDCO  Surviving   Corporation  and  shall
      constitute  the  only outstanding  shares of capital stock of the CIDCO
      Surviving Corporation.  No shares of capital stock  of Sub II  shall  be
      deemed to be  outstanding  or to have any  rights  after the CIDCO
      Effective Time.

(ix)  GraphOn Shares. Each GraphOn Share issued and outstanding at and as of the
      CIDCO Effective Time shall remain issued and outstanding following the
      CIDCO Effective Time.

(c)   SLL Merger.
      -----------

(i)   The SLL Merger  shall become  effective at the time the SLL  Certificate
      of Merger  is filed  with the Secretary of State of the State of Delaware
      or  such  later  time  as  is   specified   in  the  SLL Certificate of
      Merger (the "SLL Effective  Time").  The SLL Merger shall have the effects
      set forth in the  Delaware  Law.  The SLL Surviving  Corporation  may, at
      any time after the SLL Effective Time, take any action (including
      executing and delivering any document) in the name and on behalf of either
      SLL or Sub III in order to carry out and effectuate the transactions
      contemplated by this Agreement.

(ii)  The certificate of incorporation of SLL in effect at and as of the SLL
      Effective Time shall remain the certificate of incorporation of the SLL
      Surviving Corporation without any modification or amendment in the SLL
      Merger.

(iii) The bylaws of SLL in effect at and as of the SLL Effective Time shall
      remain the bylaws of the SLL Surviving Corporation without any
      modification or amendment in the SLL Merger.

(iv)  The directors and officers of the SLL Surviving Corporation shall be the
      individuals listed on Schedule 2.4(c)(iv) hereto.

(v)   At and as of the SLL Effective  Time, (a) each SLL Share (other than any
      Dissenting Share) issued and outstanding  immediately prior to the SLL
      Effective Time shall,  by virtue of the SLL Merger and without any action


                                       13


      on the part of the holder thereof, be converted into the right to receive
      104,533.33  GraphOn  Shares  (the  ratio of 104,533.33  GraphOn  Shares to
      one SLL Share is referred to herein as the "SLL  Conversion  Ratio"),
      subject to  rounding  up to the nearest  whole GraphOn Share in lieu of
      the issuance of fractional shares  as  provided  in  Section  2.7  hereof,
      and the  right to receive  any  dividends  or  distributions  thereon
      after the SLL Effective  Time and (b) each  Dissenting  Share shall be
      converted into  the  right  to  receive   payment  from  the  SLL
      Surviving Corporation  with respect  thereto in accordance  with Section
      2.6 hereof; provided,  however, that the SLL Conversion Ratio shall be
      subject  to  equitable  adjustment  in  the  event  of  any  stock
      issuance,  stock split,  stock  dividend,  reverse stock split, or other
      change  in the  number  of  GraphOn  Shares  or SLL  Shares outstanding
      prior to the SLL Effective Time (other  than  the Reverse Stock Split).

(vi)  At and as of the SLL Effective Time, each SLL Share held in treasury by
      SLL immediately prior to the SLL Effective Time shall, by virtue of the
      SLL Merger and without any action on the part of SLL, be canceled and
      retired, and no GraphOn Shares or other shares of capital stock or
      securities of GraphOn or Sub III shall be issuable with respect thereto.

(vii) At and as of the SLL Effective Time, each share of common stock of Sub III
      issued and outstanding immediately prior to the SLL Effective Time shall,
      by virtue of the SLL Merger and without any action on the part of GraphOn,
      be converted into and become one fully paid and nonassessable share of
      common stock of the SLL Surviving Corporation and shall constitute the
      only outstanding shares of capital stock of the SLL Surviving Corporation.
      No shares of capital stock of Sub III shall be deemed to be outstanding or
      to have any rights after the SLL Effective Time.

(viii)GraphOn Shares. Each GraphOn Share issued and outstanding at and as of the
      SLL Effective Time shall remain issued and outstanding following the SLL
      Effective Time.

2.5 Adjustments to Conversion Ratios. If, after the date hereof and prior to the
Closing Date, there is any increase or decrease in the number of issued and
outstanding Cortelco Shares, CIDCO Shares, SLL Shares, or GraphOn Shares by
reason of any stock issuances, stock splits, stock dividends, reverse stock
splits, or other changes in the number of any such shares, the Parties shall
amend this Agreement to adjust the Cortelco Conversion Ratio, the CIDCO
Conversion Ratio, and/or the SLL Conversion Ratio, as applicable, so that (a)
the total number of Merger Shares equals 70% of the issued and outstanding
GraphOn Shares immediately after the consummation of the Mergers, and (b) the
stockholders of Cortelco receive 33.33% of the Merger Shares as a result of the
Cortelco Merger, the stockholders of CIDCO receive 40.00% of the Merger Shares
as a result of the CIDCO Merger, and the stockholders of SLL receive 26.67% of
the Merger Shares as a result of the SLL Merger.

2.6 Dissenting Shares. (a) Notwithstanding any other term or provision of this
Agreement to the contrary, any Affiliated Company Shares that are outstanding
immediately prior to the Cortelco Effective Time, CIDCO Effective Time, or SLL


                                       14


Effective Time, as applicable, that are held by stockholders who (i) have not
consented to the respective Mergers, (ii) have demanded appraisal rights for
such Affiliated Company Shares in accordance with the provisions of Section 262
of Delaware Law (if such provisions provide for appraisal rights for such
Affiliated Company Shares) and (iii) have not failed to perfect or have
effectively withdrawn such demand or otherwise lost their appraisal rights (each
a "Dissenting Share" and collectively, the "Dissenting Shares"), shall not be
converted into or represent the right to receive the Merger Shares pursuant to
this Article II. Such stockholders shall be entitled to have such Affiliated
Company Shares held by them appraised in accordance with Delaware Law, except
that all Dissenting Shares held by stockholders who have failed to perfect or
have effectively withdrawn or otherwise lost their right to appraisal of such
Affiliated Company Shares under Delaware Law shall thereupon be deemed to have
been converted into, and to have become exchangeable for, as of the Cortelco
Effective Time, CIDCO Effective Time, or SLL Effective Time, as applicable, the
right to receive the Merger Shares issuable in exchange therefor pursuant to
this Article II, upon surrender of the certificates that formerly represented
such Affiliated Company Shares in accordance with Section 2.8 hereof.

             (b) The Affiliated Companies shall give GraphOn prompt notice of
any demand for appraisal received by any of them, withdrawals of demands for
appraisal, and any other instrument served on them by a stockholder pursuant to
Delaware Law.

2.7 No Fractional Shares. Notwithstanding any other provision of this Agreement,
no certificates or scrip for fractional GraphOn Shares shall be issued in the
Mergers, and any fractional interests of GraphOn Shares resulting from the
calculations provided in Section 2.4 hereof shall not entitle the owner thereof
to vote such fractional shares or to any other rights of a security holder with
respect thereto. Each holder of Affiliated Company Shares who would otherwise
have been entitled to receive a fraction of a GraphOn Share pursuant to this
Article II shall, in lieu thereof, be issued one whole GraphOn Share. For
purposes of determining whether and to what extent a stockholder is entitled to
receive a GraphOn Share in lieu of a fractional share pursuant to this Section
2.7, the Affiliated Company Shares held of record by such stockholder and
represented by two or more stock certificates of a particular Affiliated Company
shall be aggregated.

2.8   Procedure for Exchange.
      ----------------------

(a)   Immediately  after the Cortelco  Effective  Time,  CIDCO Effective Time,
      and SLL  Effective  Time,  as  applicable,  GraphOn  shall  deposit with
      American Stock  Transfer & Trust  Company,  or such other exchange agent
      selected  by  GraphOn  and  reasonably   acceptable  to  the  Affiliated
      Companies,  (the  "Exchange  Agent")  for the  benefit of the holders of
      Affiliated  Company Shares,  (i)  certificates  representing the GraphOn
      Shares that make up the Merger  Shares,  calculated as follows:  the sum
      of (x) the product of the Cortelco  Conversion  Ratio  multiplied by the
      number of Cortelco Shares (other than any Dissenting  Shares) issued and
      outstanding  immediately  prior to the Cortelco  Effective Time, (y) the
      product of the CIDCO  Conversion Ratio multiplied by the number of CIDCO
      Shares  (other  than  any  Dissenting  Shares)  issued  and  outstanding
      immediately  prior to the CIDCO  Effective  Time, and (z) the product of
      the SLL Conversion  Ratio  multiplied by the number of SLL Shares (other
      than any Dissenting Shares) issued and outstanding  immediately prior to


                                       15


      the SLL Effective Time,  and, (ii) any dividends or other  distributions
      with  respect  to  GraphOn  Shares  with a record  date at or after  the
      Cortelco  Effective Time,  CIDCO Effective Time, and SLL Effective Time,
      as applicable,  (such certificates for GraphOn Shares, together with the
      amount of any  dividends  or other  distributions  payable  with respect
      thereto,  are  referred  to as the  "Exchange  Fund")  in  exchange  for
      Affiliated Company Shares outstanding  immediately prior to the Cortelco
      Effective   Time,   CIDCO   Effective  Time,  and  SLL  Effective  Time,
      respectively,  and upon due surrender of certificates  representing  the
      Affiliated Company Shares pursuant to this Article II.

(b)   Promptly after the Cortelco  Effective  Date,  CIDCO Effective Date, and
      SLL  Effective  Date,  respectively,  GraphOn  shall cause the  Exchange
      Agent to mail to each record holder of Affiliated  Company Shares (other
      than  Dissenting  Shares) (i) a letter of  transmittal  specifying  that
      delivery  shall  be  effected,  and  risk  of  loss  and  title  to  the
      certificates  representing  Affiliated  Company Shares shall pass,  only
      upon  delivery  of  such  certificates  (or  affidavits  of loss in lieu
      thereof) to the  Exchange  Agent,  such letter of  transmittal  to be in
      such form and have such other  provisions  as GraphOn  and the  Exchange
      Agent may reasonably  agree, and (ii)  instructions for use in effecting
      the  surrender  of  the  certificates  representing  Affiliated  Company
      Shares in exchange for (A) certificates  representing GraphOn Shares and
      (B)  any  unpaid  dividends  and  other  distributions   thereon.   Upon
      surrender of a certificate  representing  Affiliated  Company Shares for
      cancellation  to  the  Exchange  Agent  together  with  such  letter  of
      transmittal,  duly  executed,  the holder of such  certificate  shall be
      entitled to receive in exchange therefor (x) a certificate  representing
      that  number of whole  GraphOn  Shares  that such  holder is entitled to
      receive  pursuant  to this  Article  II,  and (y) a check in the  amount
      (after  giving  effect to any required tax  withholdings)  of any unpaid
      non-stock  dividends and any other dividends or other distributions that
      such holder has the right to receive  pursuant to the provisions of this
      Article II, and the  certificate  representing  the  Affiliated  Company
      Shares  will be  canceled.  No  interest  will be paid or accrued on any
      amounts  payable  upon due  surrender of the  certificates  representing
      Affiliated  Company  Shares.  In the event of a transfer of ownership of
      Affiliated  Company  Shares  that  is not  registered  in  the  transfer
      records  of  the   appropriate   Affiliated   Company,   a   certificate
      representing the proper number of GraphOn Shares,  together with a check
      for  any  cash  to  be  paid  upon  due  surrender  of  the  certificate
      representing the Affiliated  Company Shares,  and any other dividends or
      distributions  in  respect  thereof  may be issued  and/or  paid to such
      transferee if the  certificate  formerly  representing  such  Affiliated
      Company  Shares is presented to the Exchange  Agent,  accompanied by all
      documents  required to evidence and effect such transfer and to evidence
      that  any  applicable  stock  transfer  taxes  have  been  paid.  If any
      certificate  for  GraphOn  Shares is to be issued in a name  other  than
      that in which the  certificate  surrendered  for  exchange  therefor  is
      registered,  it shall be a condition  of such  exchange  that the Person
      requesting  such exchange shall pay any transfer or other taxes required
      by reason of the issuance of  certificates  for GraphOn Shares in a name
      other   than  that  of  the   registered   holder  of  the   certificate
      surrendered,  or shall  establish to the  satisfaction of GraphOn or the
      Exchange Agent that such tax has been paid or is not applicable.

                                       16


(c)   GraphOn shall not pay any dividend or make any  distribution  on GraphOn
      Shares,  with a record  date at or after the  Cortelco  Effective  Time,
      CIDCO  Effective  Time, or SLL  Effective  Time, to any record holder of
      Affiliated  Company  Shares unless and until the holder  surrenders  for
      exchange  the  stock   certificate   or   certificates   that   formerly
      represented  the holder's  Affiliated  Company  Shares.  GraphOn instead
      shall pay the dividend or make the  distribution  to the Exchange  Agent
      in trust  for the  benefit  of the  holder  pending  the  surrender  and
      exchange.  No holder of Affiliated  Company  Shares shall be entitled to
      any interest or earnings on the dividend or  distribution  held in trust
      by the  Exchange  Agent  pending  receipt  thereof  by the  holder  upon
      surrender for exchange of the Affiliated Company Share certificates.

(d)   In the event any  certificate  representing  Affiliated  Company  Shares
      shall  have been  lost,  stolen,  or  destroyed,  upon the  making of an
      affidavit of such fact by the Person claiming such  certificate has been
      lost, stolen, or destroyed,  and if required by GraphOn,  the posting by
      such  Person of a bond in  customary  amount as  indemnity  against  any
      claim that may be made against it with respect to such certificate,  the
      Exchange  Agent will issue in  exchange  for such  documentation  of the
      lost,  stolen,  or  destroyed  certificate,  the GraphOn  Shares and any
      unpaid dividends or other distributions in respect thereof.

(e)   GraphOn may terminate the Exchange Fund and cause the Exchange  Agent to
      return  any  GraphOn  Shares and  dividends  and  distributions  thereon
      remaining  unclaimed  180 days after the Closing  Date,  and  thereafter
      each  remaining  record holder of Affiliated  Company Shares who has not
      surrendered for exchange the  certificates  representing  the Affiliated
      Company  Shares  shall  be  entitled  to look  to  GraphOn  (subject  to
      abandoned  property,  escheat,  and  other  similar  Laws) as a  general
      creditor  thereof with respect to the GraphOn  Shares and  dividends and
      distributions  thereon to which the holder is entitled upon surrendering
      for  exchange  the  stock  certificate  or  certificates  that  formerly
      represented  the holder's  Affiliated  Company  Shares.  Notwithstanding
      the  foregoing,  none of GraphOn,  the Cortelco  Surviving  Corporation,
      CIDCO Surviving Corporation,  SLL Surviving Corporation, or the Exchange
      Agent shall be liable to any former holder of Affiliated  Company Shares
      for any amounts  properly  delivered  to a public  official  pursuant to
      applicable abandoned property, escheat, or similar Laws.

(f)   GraphOn shall pay all fees, expenses,  and other charges of the Exchange
      Agent.

2.9 Closing of Stock Transfer Records. After the close of business on the
Closing Date, no transfer of Affiliated Company Shares outstanding prior to the
Closing Date shall be registered in the stock transfer records of any Affiliated
Company.

ARTICLE III

            REPRESENTATIONS AND WARRANTIES OF AFFILIATED COMPANIES

                                       17


      Each Affiliated Company, as to itself and all its Affiliated Company
Subsidiaries (in which case the term "Affiliated Company" small mean the
Affiliated Company and all such Affiliated Company Subsidiaries) represents and
warrants to GraphOn as follows:

3.1 Incorporation. The Affiliated Company is a corporation duly incorporated,
validly existing, and in good standing under the Laws of the jurisdiction of its
incorporation. The Affiliated Company has delivered to GraphOn complete and
correct copies of its certificate of incorporation and bylaws, each as amended
to date. The Affiliated Company's certificate of incorporation and bylaws so
delivered are in full force and effect.

3.2 Foreign Qualification. The Affiliated Company is duly qualified to conduct
business as a foreign corporation and is in good standing under the Laws of each
jurisdiction where the ownership or operation of its properties and assets or
the conduct of its business requires such qualification, except where the lack
of such qualification would not have a Material Adverse Effect.

3.3 Corporate Power and Authority. The Affiliated Company has corporate power
and authority to carry on the businesses in which it is engaged, to own and use
the properties owned and used by it, to enter into this Agreement, to perform
its obligations hereunder, and to consummate the transactions contemplated by
this Agreement.

3.4 Authorization. The board of directors of the Affiliated Company has duly
authorized the execution and delivery of this Agreement, the performance of its
obligations hereunder, and the consummation of the transactions contemplated
hereby. The stockholders of the Affiliated Company have duly adopted this
Agreement. The Affiliated Company has taken all corporate actions necessary to
authorize its execution and delivery of this Agreement, the performance of its
obligations hereunder, and the consummation of the transactions contemplated
hereby.

3.5 Execution, Delivery, and Enforceability. This Agreement has been executed
and delivered by a duly authorized officer of the Affiliated Company,
constitutes a legal, valid, and binding obligation of the Affiliated Company,
and is enforceable against the Affiliated Company in accordance with its terms.

                                       18


3.6 Capitalization. The authorized capital stock of Cortelco consists solely of
20,000 shares of common stock, par value $.001 per share (the "Cortelco
Shares"), of which 1,000 Cortelco Shares are issued and outstanding. The
authorized capital stock of CIDCO consists solely of 2,500,100 shares of common
stock, par value $.001 per share (the "CIDCO Shares"), of which 22,600 CIDCO
Shares are issued and outstanding, and 10,000,000 shares of Series A preferred
stock, par value $.001 per share, of which 9,999,900 are issued and outstanding.
The authorized capital stock of SLL consists solely of 1,000 shares of common
stock, par value $.01 per share (the "SLL Shares"), of which 100 SLL Shares are
issued and outstanding. The Cortelco Shares, the CIDCO Shares, and the SLL
Shares are referred to collectively herein as the "Affiliated Company Shares."
All the issued and outstanding Affiliated Company Shares have been duly
authorized and validly issued and are fully paid and nonassessable. None of the
issued and outstanding Affiliated Company Shares (i) was offered or sold in
violation of any provision of the Securities Act or (ii) was issued in violation
of any preemptive rights or any similar rights that entitle any Person to
acquire any Affiliated Company Shares upon the issuance or sale thereof. Except
as disclosed in Section 3.6 of the Affiliated Company Disclosure Schedule, there
are no authorized or outstanding Derivative Securities of any Affiliated Company
that are convertible into or exercisable or exchangeable for any Affiliated
Company Shares or other shares of capital stock or securities of the Affiliated
Company, and there are no preemptive or other authorized or outstanding rights,
options, warrants, calls, redemption rights, purchase rights, subscription
rights, conversion rights, exchange rights, or other contracts or commitments to
which any Affiliated Company is a party or by which it is bound providing for
the issuance, transfer, sale, or other disposition of any Affiliated Company
Shares or other shares of capital stock or securities of the Affiliated Company.
There are no authorized or outstanding stock appreciation, phantom stock, profit
participation, or similar rights with respect to the Affiliated Company Shares
or other shares of capital stock of any Affiliated Company. No Affiliated
Company has any outstanding bonds, debentures, notes or other obligations the
holders of which have the right to vote (or that are convertible into or
exercisable for securities having the right to vote) with the stockholders of
any Affiliated Company on any matter.

3.7 Notices, Filings, and Approvals. Except as disclosed in Section 3.7 of the
Affiliated Company Disclosure Schedule, no notice to, filing with, or approval,
authorization, consent, order, or other action by, any Person is required of the
Affiliated Company for the execution and delivery of this Agreement, the
performance of its obligations hereunder, or the consummation of the
transactions contemplated hereby.

3.8 Compliance. The Affiliated Company is in compliance with all the provisions
of (a) its certificate of incorporation and bylaws, (b) all applicable Laws,
including the Federal Communications Act of 1934, as amended (the "Federal
Communications Act"), and with all applicable rules, and regulations of all
Governmental Authorities, including, without limitation, the Federal
Communications Commission, (c) all permits, approvals, authorizations,
certificates of convenience or necessity, licenses, privileges, and
registrations necessary for the ownership of its assets and properties and the
conduct of its business, (d) all judgments, decrees, orders, writs, injunctions,
and other rulings of all Governmental Authorities, and other authorities having
jurisdiction over the Affiliated Company or any of its properties, assets, or


                                       19


operations, and (e) all Contracts to which the Affiliated Company is a party or
is otherwise bound, except in the case of clauses (b), (c) and (e) for such
instances of non-compliance that in the aggregate have not had and could not
reasonably be expected to have a Material Adverse Effect. The Affiliated Company
is not required to obtain any licenses, permits, approvals, or authorizations or
make any filings with the Federal Communications Commission pursuant to the
Federal Communications Act or with any similar state regulatory agency or
authority to conduct the Affiliated Company's business. No Affiliated Company
has received any written notice or communication of any material failure to
comply with any of the foregoing that has not been cured (as evidenced by a
written notice to such effect, a copy of which has been provided to GraphOn) as
of the date hereof. The Affiliated Company has all permits, licenses, variances,
exemptions, orders, and other governmental authorizations, consents, and
approvals necessary to conduct its business as presently conducted, except for
those the absence of which would not be reasonably likely to result in a
Material Adverse Effect. In the past three years, no Affiliated Company has had
any license, certificate of authority, or permit revoked or has had any
Governmental Authority deny any of its applications for a license, permit, or
certificate of authority except for those revocations or denials that have not
had or could not reasonably be expected to have a Material Adverse Effect.

3.9 Noncontravention. Neither the execution or delivery by the Affiliated
Company of this Agreement, nor the performance of its obligations hereunder, nor
the consummation of the transactions contemplated hereby, does or will, whether
with or without the giving of notice or the passage of time or both, (a) result
in any violation of or conflict with any provision of (i) the certificate of
incorporation or bylaws of the Affiliated Company, (ii) any applicable Law,
(iii) any permit, approval, authorization, certificate of convenience or
necessity, license, privilege, or registration necessary for the ownership of
its assets and properties and the conduct of its business, or (iv) any judgment,
decree, order, writ, injunction, or other ruling of any Governmental Authority,
or other authority having jurisdiction over the Affiliated Company or any of its
properties, assets, or operations, (b) conflict with, result in a breach of,
constitute a default or event of default under, result in the acceleration of
performance under, result in the termination of, loss of a material benefit
under, or create in any party the right to accelerate, terminate, cancel, or
modify, any provision of any Contract to which the Affiliated Company is a party
or is otherwise bound, or (c) result in the imposition of any Encumbrance upon
any assets or properties of the Affiliated Company.

3.10 Investments. The Affiliated Company has no Subsidiaries and does not own of
record or beneficially any capital stock or other securities of, or any other
equity or proprietary interest in, any other Person.

3.11 Financial Statements. True and complete copies of Cortelco's audited
balance sheets as of July 31, 2001, and July 31, 2000, its audited statements of
income, stockholders' equity, and cash flow for the years ended July 31, 2001,
and July 31, 2000, its unaudited balance sheet as of June 30, 2002, and its
unaudited statements of income and cash flows for the period ended June 30, 2002
(collectively, the "Cortelco Financial Statements") are set forth in Section
3.11-A of the Affiliated Company Disclosure Schedule. True and complete copies
of CIDCO's audited balance sheet as of December 31, 2001, its audited statements
of income, stockholders' equity, and cash flows for the year ended December 31,
2001, its unaudited balance sheet as of June 30, 2002, and its unaudited
statements of income and cash flows for the period ended June 30, 2002


                                       20


(collectively, the "CIDCO Financial Statements") are set forth in Section 3.11-B
of the Affiliated Company Disclosure Schedule. True and complete copies of SLL's
unaudited balance sheets as of December 31, 2001, and June 30, 2002, and its
unaudited statements of income and cash flows for the year ended December 31,
2001, and the period ended June 30, 2002 (collectively, the "SLL Financial
Statements") are set forth in Section 3.11-C of the Affiliated Company
Disclosure Schedule. The Cortelco Financial Statements, the CIDCO Financial
Statements, and the SLL Financial Statements are referred to collectively herein
as the "Affiliated Company Financial Statements." The Affiliated Company
Financial Statements have been prepared in accordance with GAAP applied on a
consistent basis throughout the respective periods covered thereby, and present
fairly, in all material respects, the financial position of the Affiliated
Company as of the respective dates thereof, and the results of operations,
changes in stockholders' equity, and cash flows of the Affiliated Company for
the respective fiscal years and periods covered thereby. As of their respective
dates, the Affiliated Company Financial Statements did not, or do not, as the
case may be, contain any untrue statement of a material fact or omit to state a
material fact required to be stated therein or necessary to make the statements
made therein, in light of the circumstances in which they were made, not
misleading.

3.12 No Undisclosed Liabilities. The Affiliated Company has no material
Liabilities, except for (a) the Liabilities reflected or reserved against in the
most recent Affiliated Company Financial Statement and (ii) current Liabilities
incurred in the ordinary course of business since the date of the most recent
Affiliated Company Financial Statement.

3.13 Accounting Controls. The Affiliated Company maintains a system of internal
accounting controls sufficient to provide reasonable assurances that (a)
transactions are executed in accordance with management's general or specific
authorization, (b) transactions are recorded as necessary to permit the
preparation of financial statements in conformity with GAAP and to maintain
accountability for assets, (c) access to assets is permitted only in accordance
with management's general or specific authorization, and (d) the recorded
accountability for assets is compared with the existing assets at reasonable
intervals and appropriate action is taken with respect to any differences.

3.14 Off-Balance-Sheet Transactions. There are no transactions, arrangements, or
other relationships between and/or among the Affiliated Company, any of its
Affiliates, and any unconsolidated entity, including, without limitation, any
structural finance, special purpose, or limited purpose entity.

3.15 Related-Party Transactions. There are no transactions or business
relationships between the Affiliated Company and any Related Party. The
Affiliated Company is not a party to or bound by any Contract with any Related
Party. The Affiliated Company has no Liability to any Related Party, or vice
versa, arising from or in connection with any such transaction or business
relationship. No Related Party owns or leases any assets or properties of the
Affiliated Company.

3.16 Absence of Certain Developments. Except as disclosed in Section 3.16 of the
Affiliated Company Disclosure Schedule, since the date of the balance sheet
comprising a portion of the most recent CIDCO Financial Statement, Cortelco
Financial Statement and SLL Financial Statement (each an "Affiliated Company
Balance Sheet Date," as applicable), there has not been any state of facts,


                                       21


change, circumstance, development, or event that has had or would reasonably be
expected to have a Material Adverse Effect on the Affiliated Companies, either
individually or taken as a whole. In particular, since the applicable Affiliated
Company Balance Sheet Date through the date hereof, each Affiliated Company has
not:

(a)   conducted  its  business   outside  the  ordinary   course  of  business
      consistent with past practice;

(b)   made or suffered any material change in the nature or conduct of its
      business, regardless of whether such change has had or could reasonably be
      expected to have a Material Adverse Effect;

(c)   received notice that any of its suppliers or customers intends to alter
      the amount of business conducted with the Affiliated Company or to cease
      conducting business with the Affiliated Company altogether, which
      alteration or cessation of business would have a Material Adverse Effect;

(d)   entered into,  amended in any material  respect,  or terminated in whole
      or in material part any material Affiliated Company Contract;

(e)   (i) made or incurred any capital expenditure, except in the ordinary
      course of business consistent with past practice, or (ii) made or incurred
      any capital expenditure in excess of $50,000 in the aggregate;

(f)   sold, assigned, licensed, exchanged, leased, transferred or otherwise
      disposed of any of its assets or properties, other than for a fair
      consideration and except in the ordinary course of business consistent
      with past practice with suitable replacements being obtained therefor to
      the extent necessary to operate the business;

(g)   suffered any material damage to or destruction or loss of any of its
      assets or properties, regardless of whether such damage, destruction, or
      loss was covered by insurance;

(h)   purchased, leased, or otherwise acquired any assets or properties, except
      in the ordinary course of business consistent with past practice;

(i)   (i) incurred any Liability to any Person, except in the ordinary course of
      business consistent with past practice, or (ii) incurred any Liability to
      any Person involving actual or potential aggregate future payments by the
      Affiliated Company in excess of $100,000;

(j)   borrowed  any money or issued any  bonds,  debentures,  notes,  or other
      instruments evidencing borrowed money;

(k)   paid,  discharged,  or satisfied any of its  Liabilities,  except in the
      ordinary course of business consistent with past practice;

                                       22


(l)   failed to pay, discharge, or satisfy any of its Liabilities when due and
      payable or materially delayed doing any of the foregoing, except for such
      Liabilities that it believes in good faith are not owed and do not exceed,
      individually or in the aggregate, $10,000;

(m)   received notice that any Person party thereto has accelerated,
      terminated, modified, or cancelled any material Affiliated Company
      Contract;

(n)   made any loan or advance of money to any Person in an amount in excess of
      $5,000 or made loans or advanced money to Persons in the aggregate in
      excess of $25,000;

(o)   compromised,  canceled,  waived, or released any material claim or right
      of the Affiliated Company or any material Liability of any other Person;

(p)   received notice that any material Liability has been asserted against
      the Affiliated Company;

(q)   subjected  any of its  assets or  properties,  or  permitted  any of its
      assets or  properties  to be subjected  to, any  Encumbrance  except for
      Permitted Liens;

(r)   increased by more than 5% the total annual cash compensation payable to
      any employee whose total annual cash compensation prior to such increase
      was less than $50,000;

(s)   made any material change in the employment terms of any director,
      officer, or employee outside the ordinary course of business consistent
      with past practice;

(t)   (i) adopted, established, amended, or terminated any Employee Benefit
      Plan, or (ii) paid any amount or provided any benefit under any Employee
      Benefit Plan, except in the ordinary course of business consistent with
      past practice;

(u)   (i) experienced any labor organizational effort, strike,  organized work
      stoppage or interruption,  or organized work slowdown, (ii) received any
      written claim or grievance,  unfair labor practice  charge or complaint,
      charge of discrimination,  or occupational health and safety citation or
      complaint  involving any present or former  employee or other  personnel
      retained  by  the  Affiliated  Company  other  than  routine  individual
      grievances,  or (iii)  experienced any change in its employee  relations
      that has had or could  reasonably be expected to have a Material Adverse
      Effect;

(v)   (i) amended or authorized amendment of its certificate of incorporation or
      bylaws, or (ii) rescinded or modified or authorized rescission or
      modification of any resolutions adopted by its board of directors or
      stockholders;

(w)   (i)  changed its  authorized  capital  stock,  (ii)  effected  any stock
      split,  reverse  stock split,  or other  recapitalization  affecting its


                                       23


      capital stock,  (iii) issued or sold or otherwise disposed of any of its
      capital stock,  options,  warrants,  calls,  or other rights to purchase
      capital  stock,  any securities  convertible  into or  exchangeable  for
      capital  stock,  or  other  securities,  or  (iv)  purchased,  redeemed,
      retired,  or  otherwise  acquired  any of its  capital  stock  or  other
      securities;

(x)   declared,  paid, or set aside for payment any dividends,  distributions,
      or payments on its capital stock (whether in cash or in kind);

(y)   (i) changed any of its accounting methods,  principles,  assumptions, or
      practices,  or (ii)  written  up,  down,  or off the value of any of its
      assets;

(z)   (i) failed to pay when due any premium with respect to any insurance
      policy covering the Affiliated Company or its business, assets,
      properties, directors, officers, or employees, or (ii) canceled or failed
      to renew any such insurance policy; or

(aa)  agreed, committed, or otherwise arranged to take or suffer the taking of
      any action described in this Section 3.16, regardless of whether such
      agreement, commitment, or other arrangement is oral, written or otherwise.

3.17 Title to, and Sufficiency of, Assets. Except as disclosed in Section 3.17
of the Affiliated Company Disclosure Schedule, the Affiliated Company has full
legal and beneficial title to or a valid license or leasehold interest in all
the assets and properties owned or used by it and reflected on its most recent
Affiliated Company Financial Statement (including, without limitation, all
furniture, fixtures, fixed assets, equipment, personal property, real property,
leasehold interests and improvements, cash and cash equivalents, accounts
receivable, notes receivable, negotiable instruments, chattel paper, deposits,
inventory, Contract interests, Affiliated Company Intellectual Property,
computer software (including source codes), permits, business books and records,
business materials, corporate books and records, tax credits and refunds, and
insurance policies and rights with respect thereto), free and clear of all
Encumbrances except for Permitted Liens. Such assets constitute substantially
all the assets and properties necessary to conduct its business as currently
conducted.

3.18 Condition of Assets. All assets and properties owned or used by the
Affiliated Company in the conduct of its business are in good condition and
working order, ordinary wear and tear excepted, and are suitable for the
purposes for which they are currently used.

3.19 Intellectual Property. The Affiliated Company represents and warrants that
it owns, or has other legitimate and recognized proprietary rights in, all the
Intellectual Property necessary to conduct the Affiliated Company's business as
currently conducted. The Affiliated Company warrants that all rights in the
Affiliated Company Intellectual Property are valid and subsisting. The
Affiliated Company has taken all commercially reasonable measures to protect its
rights with respect to its Affiliated Company Intellectual Property, including
those measures required by Law. All maintenance, annuity, renewal, and other
fees required to be paid by the Affiliated Company as of the date hereof with
respect to the registration and protection of its Affiliated Company


                                       24


Intellectual Property have been timely paid. To its Knowledge, the Affiliated
Company is not required to pay any royalty, honorarium, fee, or other amount to
any Person for its use of any non-proprietary Affiliated Company Intellectual
Property. The Affiliated Company has no Knowledge that its use of any of the
Affiliated Company Intellectual Property infringes or has infringed any
Intellectual Property right of any Person, or that it has, through such use,
misappropriated or improperly used or disclosed any Intellectual Property of any
Person. There is no pending or, to the Knowledge of the Affiliated Company,
threatened claim, charge, demand, inquiry, investigation, action, suit,
arbitration, or other legal proceeding relating to any of the Affiliated Company
Intellectual Property. Following its Merger, the Affiliated Company will
continue to own or have the uninterrupted right to use the Affiliated Company
Intellectual Property pursuant to the same terms and conditions existing on the
date hereof.

3.20 Contracts. Except as disclosed in Section 3.20 of the Affiliated Company
Disclosure Schedule, the Affiliated Company is not a party to or bound by any of
the following Contracts (collectively, the "Affiliated Company Contracts"):

(a)   Contract that is not in the ordinary course of business;

(b)   Contract that (i) involves or could reasonably be expected to involve
      aggregate future payments by the Affiliated Company in excess of $50,000
      and (ii) is not terminable by the Affiliated Company within 90 days after
      giving notice to the other party to the Contract without any penalty,
      premium, or continuing Liability being imposed on the Affiliated Company;

(c)   Contract with any Related Party;

(d)   Contract for the sale, assignment, license, exchange, lease, transfer, or
      other disposition of any of its assets or properties, other than for a
      fair consideration and except in the ordinary course of business
      consistent with past practice;

(e)   Contract for the purchase, lease, or other acquisition of any assets or
      properties, except in the ordinary course of business consistent with past
      practice;

(f)   Contract for the merger, consolidation,  recapitalization,  or any other
      reorganization of the Affiliated Company, except for this Agreement;

(g)   Contract for the borrowing of money from any Person;

(h)   Contract for the lending or advancing of money to any Person;

(i)   Contract with any Governmental Authority;

(j)   Contract for the employment of any Person (other than employment that is
      terminable at will) or for consulting, contracting, agency, or other
      similar services by any Person in excess of $50,000;

(k)   Contract  relating to the  termination  of any  Person's  employment  or
      providing  severance or other  post-termination  benefits in  connection
      therewith;

                                       25


(l)   Contract  with any labor  union,  including  any  collective  bargaining
      agreement;

(m)   Contract  that limits the right of the  Affiliated  Company to engage in
      any business or to compete with any Person;

(n)   Contract that is in violation of Law or the  performance  of which is or
      would be in violation of Law;

(o)   Contract that requires the  approval,  authorization,  or consent of any
      party thereto to the  consummation of the  transactions  contemplated by
      this Agreement; or

(p)   any other Contract the  performance of which involves  consideration  in
      excess of $50,000.

The Affiliated Company has delivered true and complete copies of all of its
Affiliated Company Contracts to GraphOn prior to the date hereof. Each
Affiliated Company Contract was entered into on the basis of arms-length
negotiations between the Affiliated Company and each other party thereto. Each
Affiliated Company Contract is as of the date hereof, and will continue to be
following the consummation of the Mergers, valid, in full force and effect, and
enforceable against each other party thereto in accordance with its terms. There
is no conflict, disagreement, or dispute regarding any Affiliated Company
Contract between the Affiliated Company and any other party thereto, which if
unresolved would have or could reasonably be expected to have a Material Adverse
Effect. The Affiliated Company has not threatened, and has no Knowledge that any
other party has threatened, to cancel any Affiliated Company Contract. There is
no breach or default under any Affiliated Company Contract by the Affiliated
Company or any other party thereto, which if not cured would have or could
reasonably be expected to have a Material Adverse Effect. No act, omission,
event, development, condition, or circumstance known to the Affiliated Company
has occurred or is existing that, with or without the giving of notice or the
passage of time or both, would become or result in any breach or default under
any Affiliated Company Contract by the Affiliated Company or any other party
thereto, which if not cured would have or could reasonably be expected to have a
Material Adverse Effect. The Affiliated Company has not released or waived any
material right or remedy under any Affiliated Company Contract. The Affiliated
Company is not subject to any material legal obligation, and has no Knowledge
that any other party has any legal right, to materially renegotiate any
Affiliated Company Contract. The Affiliated Company has no Knowledge of any
pending or threatened bankruptcy, insolvency, or similar proceeding with respect
to any other party to the Affiliated Company Contracts.

3.21 Taxes. All Tax Returns required to be filed by the Affiliated Company with
all taxing authorities on or before the date hereof have been timely filed. All
such filed Tax Returns have been prepared in accordance with all applicable Laws
and correctly reflect in all material respects the facts regarding the
Affiliated Company's income, business, assets, operations, activities, and
status and all other information required to be shown thereon as of the date of
filing. The Affiliated Company has timely paid all Taxes shown on the books and
records of the Affiliated Company to be due and reflected on such filed Tax


                                       26


Returns. The Affiliated Company has timely made all required deposits and
estimated payments with respect to accrued Taxes as of the date of such
statements. The reserves for Taxes contained in its most recent Affiliated
Company Financial Statement are adequate to cover all accrued and unpaid Taxes
as of the date hereof. The Affiliated Company has withheld or collected from
each payment made to each of its employees the amount of all Taxes required to
be withheld or collected therefrom, and the Affiliated Company has paid the same
to the appropriate taxing authority or depository. The Affiliated Company (a)
has not been audited by any taxing authority, (b) has no Knowledge that any
taxing authority is contemplating an audit, (c) has not received from any taxing
authority any written notice of deficiencies, adjustments, assessments, or other
charges with respect to Taxes paid or payable, or (d) made any payment, or
provided any benefit, to any present or former director, officer, or employee
that is not allowable as a deduction under the Code. No extension of time for
the filing of Tax Returns or the payment of Taxes by the Affiliated Company is
in effect on the date hereof. The Affiliated Company has not within the last
five years (i) redeemed, retired, or otherwise acquired any of its capital stock
or other securities, or (ii) declared, paid or set aside for payment any
dividends, distributions, or payments on its capital stock except as disclosed
in Section 3.21 of the Affiliated Company Disclosure Schedule.

3.22 Insurance. All Insurance Policies to which the Affiliated Company is a
party or under which it is covered as of the date of this Agreement are
disclosed in Section 3.22 of the Affiliated Company Disclosure Schedule, and the
Affiliated Company has delivered true and complete copies of all such Insurance
Policies (and correspondence relating to coverage thereunder) and of all pending
applications for Insurance Policies to GraphOn prior to the date hereof. Each of
the Insurance Policies to which the Affiliated Company is a party or that
provides coverage to it is as of the date hereof, and will continue to be
following the consummation of the Mergers, valid, in full force and effect, and
enforceable in accordance with its terms. The Affiliated Company has paid all
premiums and other costs with respect to each Insurance Policy to which it is a
party or that provides coverage to it and has otherwise performed all of its
obligations under each such Insurance Policy. All Insurance Policies, taken
together, provide adequate insurance coverage for the business, assets,
properties, and employees of the Affiliated Company for all risks normally
insured against by a Person carrying on the same business as the Affiliated
Company in locations in which the Affiliated Company's business is conducted,
and such Insurance Policies are sufficient for compliance with all Laws
applicable to the Affiliated Company and with all Affiliated Company Contracts.
There is no claim insured under any Insurance Policy of which the Affiliated
Company has not properly and timely notified the applicable insurer. There is no
pending claim filed by the Affiliated Company under any Insurance Policy as to
which the insurer has denied coverage or is defending under a reservation of
rights. The Affiliated Company has not received (a) any refusal of coverage or
any notice that a defense will be afforded with reservation of rights or (b) any
notice of cancellation or any other indication that any Insurance Policy is no
longer in full force or effect or that the applicable insurer is not willing or
able to perform its obligations thereunder. The Affiliated Company is not
obligated under any Contract to provide insurance coverage to any third party
(including Related Parties).

3.23 Employment and Labor. The Affiliated Company is not delinquent in the
payment of any wages, salaries, commissions, bonuses, reimbursements, or other
compensation payable to any of its present or former employees. Except as


                                       27


disclosed in Section 3.23 of the Affiliated Company Disclosure Schedule, the
employment of each employee of the Affiliated Company is terminable at will
without any cost or Liability to the Affiliated Company, except for the payment
of accrued wages, salaries, commissions, bonuses, reimbursements, and other
compensation and the provision of benefits under the Employee Benefit Plans. The
Affiliated Company has no Knowledge that any of its directors, officers, or
other management-level employees intends to terminate his or her employment with
the Affiliated Company, except as contemplated by this Agreement. The Affiliated
Company is in compliance with all applicable Laws relating to employment and
employment practices, terms and conditions of employment, wages and hours,
occupational health and safety, and the employment of non-residents, except for
such instances of non-compliance that in the aggregate have not had and could
reasonably be expected not to have a Material Adverse Effect. There is no
outstanding and unresolved written claim or grievance, unfair labor practice
charge or complaint, charge of discrimination, or health and safety citation or
complaint involving any present or former employee or other personnel retained
by the Affiliated Company other than routine individual grievances. There is no
pending or, to the Knowledge of the Affiliated Company, threatened claim,
charge, demand, inquiry, investigation, action, suit, arbitration, or other
legal proceeding concerning the Affiliated Company's employment practices. The
Affiliated Company is not a party to any collective bargaining agreement or
other Contract with any labor union and has not received written notice of any
labor organizational efforts with respect to its employees. The Affiliated
Company has not experienced any strike, organized work stoppage or interruption,
or organized work slowdown by its employees during the last three years.

3.24  Employee Benefit Plans.
      ----------------------

(a)   All Employee  Benefit  Plans  maintained  or operated by the  Affiliated
      Company or an ERISA Affiliate of such Affiliated  Company or under which
      it has any  Liability  are  disclosed in Section 3.24 of the  Affiliated
      Company  Disclosure  Schedule.  Section 3.24 of the  Affiliated  Company
      Disclosure  Schedule  contains a true and complete  list of all employee
      handbooks,  manuals,  brochures,  publications  or similar  documents of
      each  Affiliated  Company  regarding  office  administration,  personnel
      matters and hiring, evaluation,  supervision,  training, termination and
      promotion of  employees of the  Affiliated  Company,  including  but not
      limited to the  Affiliated  Company's  affirmative  action plan, if any,
      and all communications to employees  concerning such matters ("Personnel
      Documents").  The  Affiliated  Company has furnished to GraphOn true and
      correct  copies  of all the  documents  listed  in  Section  3.24 of the
      Affiliated  Company  Disclosure  Schedule.  True,  complete  and correct
      copies  of the  following  have  been  delivered  to  Graphon:  (i) each
      Employee  Benefit Plan,  and a written  summary of any Employee  Benefit
      Plan not in writing,  (ii) all collective bargaining  agreements,  (iii)
      the most recent  determination letter received from the Internal Revenue
      Service,  (iv) the most recent application for determination  filed with
      the Internal Revenue  Service,  (v) the summary plan description and all
      summaries of material  modifications and all material  communications to
      employees with respect to any Employee  Benefit Plan, (vi) the five most
      recent  annual  reports on Internal  Revenue  Service Form 5500 or 5500C
      for each  Employee  Benefit  Plan  including  Schedule A and  Schedule B
      thereto  (except in the case of an Employee  Benefit  Plan that has been
      in  existence  for less than 5 years,  in which case,  for as long as it
      has been in existence),  (vii) actuarial reports, if applicable, and the
      most recent periodic  accounting of related plan assets,  and (viii) all
      related trust  agreements,  annuity  contracts,  insurance  contracts or


                                       28


      other funding  arrangements  which implement any Employee  Benefit Plan,
      and  (ix) in  the case of stock  options  or stock  appreciation  rights
      issued under any Employee  Benefit Plan which is a stock option or stock
      appreciation  rights plan, a list of holders,  dates of grant, number of
      shares,  exercise  price per share and dates  exercisable,  and (x) each
      Personnel Document.

(b)   The Affiliated  Company has received a current  favorable  determination
      letter for each  Employee  Benefit Plan  intended to be qualified  under
      Section  401(a)  of the  Code.  No act,  omission,  event,  development,
      condition,  or circumstance known to the Affiliated Company has occurred
      or is existing  that would  cause any  Employee  Benefit  Plan to become
      disqualified  for  purposes  of Section  401(a) of the Code.  Each trust
      intended to qualify under Section  501(c)(9) of the Code so qualifies in
      form and in operation,  meets the  requirements of Section 505(c) of the
      Code and the regulations thereunder,  and has received an opinion letter
      from the Internal  Revenue Service that such trust so qualifies,  and no
      fact or event has  occurred  since the date of any opinion  letter which
      could  affect  adversely  the  exempt  status  of any  such  trust.  The
      Affiliated  Company is, and each Employee Benefit Plan is maintained and
      operated,  in compliance  with all applicable  Laws relating to Employee
      Benefit Plans  (including,  without  limitation,  Section  401(a) of the
      Code and ERISA) and all the terms of such Employee Benefit Plan,  except
      for such instances of non-compliance  that in the aggregate have not had
      and  could  reasonably  be  expected  not  to  have a  Material  Adverse
      Effect.  The  Affiliated  Company has not incurred any  Liability to the
      IRS, the DOL, or the PBGC  in connection with any Employee Benefit Plan.

(c)   Neither the  Affiliated  Company nor any of its  officers or  directors,
      has  taken  any  action  directly  or  indirectly  which  obligates  the
      Affiliated  Company  to  institute  or  modify or  change  any  Employee
      Benefit  Plan,  any  actuarial  or other  assumption  used to  calculate
      funding  obligations  with  respect to any of the  Affiliated  Company's
      Employee  Benefit Plans, or the manner in which  contributions to any of
      the  Employee  Benefit  Plans  are  made  or the  basis  on  which  such
      contributions are determined.

(d)   With  respect  to  each   Employee   Benefit  Plan  (i)  no   prohibited
      transaction  as defined in Section  406 of ERISA or Section  4975 of the
      Code has occurred,  (ii) neither the  Affiliated  Company nor any of its
      current  of  former   directors,   officers,   employees  or  any  other
      "fiduciary,"   within  the  meaning  of  Section  3(21)  of  ERISA,  has
      committed  any breach of  fiduciary  responsibility  imposed by ERISA or
      any other  applicable  Law, or has any  Liability  for failure to comply
      with ERISA or the Code for any  action or  failure to act in  connection
      with the  administration  or  investment  of the assets of any  Employee
      Benefit  Plan,  and  there is no  pending,  or to the  Knowledge  of the
      Affiliated Company,  threatened or anticipated action, suit,  grievance,
      arbitration  or other manner of  litigation  or claim under any Employee
      Benefit Plan or with respect to the assets  thereof,  or by or on behalf
      of any current or former director,  officer or employee, or dependent or
      beneficiary  thereof,  or  otherwise  (other  than  routine  claims  for
      benefits where the plan's  administrative  claims  procedure has not yet
      been  exhausted),  including  but  not  limited  to  any  action,  suit,
      grievance,  arbitration or other manner of litigation or claim regarding
      conduct which  allegedly  interferes with the attainment of rights under


                                       29


      any Employee Benefit Plan, (iii) neither the Affiliated  Company nor any
      of its  directors or officers or any  fiduciary of any Employee  Benefit
      Plan  has  any   Knowledge  of  any  facts  which  could  give  rise  to
      arbitration  or other  manner  of  litigation  or  claims  with  respect
      thereto  except  for  such  instances  of  non-compliance  that  in  the
      aggregate  have not had and could  reasonably  be expected not to have a
      Material Adverse Effect.

(e)   All reports and descriptions of the Employee Benefit Plans (including,
      without limitation, IRS Form 5500 annual reports, summary annual reports,
      and summary plan descriptions) required to be filed by the Affiliated
      Company with the IRS, the DOL, or the PBGC on or before the date hereof
      have been timely filed, and as appropriate, have been timely provided to
      the participants in the Employee Benefit Plans.

(f)   There is no pending or, to the Knowledge of the Affiliated Company,
      threatened claim, charge, demand, inquiry, investigation, action, suit,
      arbitration, or other legal proceeding relating to any Employee Benefit
      Plan, except for claims for benefits thereunder made in the ordinary
      course.

(g)   The  consummation  of the  transactions  contemplated  by this Agreement
      will not  accelerate  the time of vesting or payment,  or  increase  the
      amount,  of the  compensation  or benefits to be paid or provided to any
      present or former  officer or employee  of the  Affiliated  Company.  No
      Contract or Employee  Benefit Plan  provides  for any "excess  parachute
      payment,"  within the  meaning of Section  4999 of the Code,  upon or in
      connection  with the  consummation of the  transactions  contemplated by
      this Agreement.

(h)   The Affiliated Company has not been liable at any time for contributions
      to any Employee Benefit Plan that is or was subject to Title IV of ERISA.

(i)   The Affiliated Company or an ERISA Affiliate of the Affiliated  Company,
      as  applicable,  has made all  contributions  required  to be made by it
      pursuant to the terms of any  Employee  Benefit  Plan or any  collective
      bargaining  agreement to which it is a party or as otherwise required by
      applicable law. With respect to each Employee  Benefit Plan,  subject to
      only  normal  retrospective  adjustments  in the  ordinary  course,  all
      insurance  premiums,  including  premiums to the PBGC, have been paid in
      full for policy years or other  applicable  policy  periods ending on or
      prior  to  the  date  hereof.   There  exists  no  "accumulated  funding
      deficiency"  within the  meaning of Section 302 of ERISA and Section 412
      of the Code,  with respect to any Employee  Benefit Plan,  regardless of
      whether such deficiency has been waived.

(j)   The  Affiliated  Company  does not  have,  and the  consummation  of the
      transactions  contemplated  by this  Agreement  will not  result in, any
      Liability  for (a)  any  minimum  funding  contribution  required  under
      Section  302(c)(11) of ERISA or Section  412(c)(11) of the Code, (b) any
      payment  required under Section 302(e) of ERISA or Section 412(m) of the
      Code,  (c) any lien  imposed  under  Section  302(f) of ERISA or Section


                                       30


      412(n) of the Code,  (d) any  excise  tax  imposed  with  respect  to an
      accumulated  funding  deficiency under Section 4971 of the Code, (e) the
      termination of or withdrawal  from any plan under  Sections 4062,  4063,
      or 4064 of ERISA,  or (f) the withdrawal  from any  multi-employer  plan
      under Section 4201 of ERISA.

(k)   No  Employee  Benefit  Plan is (i) a  "multiemployer  plan"  within  the
      meaning  of  Section  3(37) or  Section  4001(a)(3)  of ERISA or Section
      414(f)  of the  Code,  (ii) a  "multiple  employer  welfare  plan"  or a
      "multiple  employer welfare  arrangement"  within the meaning of Section
      514(b)(6) of ERISA,  or a "welfare  benefit  fund" within the meaning of
      Section  419(e) of the Code.  The  Affiliated  Company has not  incurred
      and does not  expect  to incur any  withdrawal  Liability  (either  as a
      contributing  employer or as part of a controlled group which includes a
      contributing  employer) to any  multiemployer  plan, in connection  with
      any  complete  or  partial  withdrawal  from such plan  occurring  on or
      before the Closing Date or as a result of the transactions  contemplated
      under this Agreement.

(l)   No  Employee  Benefit  Plan  provides  medical,  life or  other  welfare
      benefits  (whether or not  insured),  with  respect to current or former
      employees after  retirement or other  termination of service (other than
      coverage  mandated by applicable  Law).  With respect to any Contract or
      arrangement  with an  insurance  company  providing  funding  under  any
      Employee  Benefit Plan,  there is no Liability for any retroactive  rate
      adjustment.  The Affiliated  Company has the right to amend or terminate
      its  participation  with respect to each  Employee  Benefit  Plan.  Each
      Employee  Benefit Plan that is a "group health plan," within the meaning
      of  Section  5000 of the Code  has  been  operated  in  compliance  with
      Section  4980B of the Code or Sections  601 through 608 of ERISA and the
      secondary  payor  requirements of Section 1862(b) of the Social Security
      Act.  No  claim  for  medical   benefits  has  been  incurred  (but  not
      reported)  under any  Employee  Benefit Plan with respect to any current
      or former  employee (or the spouse of dependent of such employee)  which
      is in excess of $25,000.

(m)   The total aggregate  potential  maximum liability for the entire current
      fiscal  year and any  remaining  earned  but  unpaid  amounts  for prior
      fiscal  years  under any cash bonus plan  listed in Section  3.24 of the
      Affiliated  Company  Disclosure  Schedule is $107,500,  of which 70% has
      been accrued as a liability on the balance  sheet of Cortelco as of June
      30,  2002.  The  Affiliated  Company has  continued to accrue since June
      30,  2002  all  amounts  payable  pursuant  to any  cash  bonus  plan in
      accordance with its past practice.

3.25  Environmental Matters.
      ---------------------

(a)   The Affiliated Company and its business are in compliance in all
      material respects with all applicable Environmental Laws in connection
      with the ownership, operation and condition of its properties (whether
      owned or leased), assets, and business and have all permits, licenses,
      approvals, and other such authorizations from Governmental Authorities
      to operate its business in full compliance with Environmental Law, and,
      as of the date of this Agreement, neither the Affiliated Company nor
      its business has received any notice, order or directive from any
      Governmental Authority alleging a violation of any Environmental Law.

                                       31


(b)   To the Knowledge of the Affiliated Company:

(i)   There are no Contaminants located on, contained in, or otherwise part
      of the Affiliated Company's properties (whether owned or leased), assets,
      or business other than in accordance with applicable Law that will require
      any investigation or remediation, and there has not been any past or
      ongoing release of Contaminants into the environment on, from, within or
      onto any locations where wastes from the operation of any its properties
      (whether owned or leased), assets, or business in each case except where
      same would not have a Material Adverse Effect;

(ii)  There are no PCBs that are located on, contained in or otherwise a part of
      its properties (whether owned or leased), assets, or business;

(iii) No Person may have suffered any injury or incurred any damage of any type
      whatsoever as the result of the release of or exposure to Contaminants
      from its properties (whether owned or leased), assets, or business; and

(iv)  There are no locations where Contaminants from the operation of its
      properties (whether owned or leased), assets, or business have been
      stored, treated, or recycled or disposed of, other than in accordance with
      applicable Law, other than as would not have a Material Adverse Effect.

(c)   There are no underground or above ground storage tanks located upon any of
      the Affiliated Company's properties (whether owned or leased) or assets.

(d)   Neither the Affiliated Company nor its business has received, as of the
      date of this Agreement, any written directive, order or notice from any
      Governmental Authority or any other Person alleging that either the
      Affiliated Company or its business is actually or potentially liable
      under any Environmental Law for the costs of investigation or
      remediation of any properties (whether owned or leased) or other real
      property to which Contaminants generated in connection with the
      Affiliated Company's business were transferred.  Copies of any
      environmental investigations, studies, audits, tests, reviews, or
      analyses relating to any properties (whether owned or leased) conducted
      by or on behalf of the Affiliated Company or provided by any of its
      predecessors to the Affiliated Company within the last five (5) years,
      have been provided to GraphOn.

3.26 Importing and Exporting Activities. The Affiliated Company has paid all
customs duties owing with respect to any and all imported merchandise, and all
customs entry information provided by the Affiliated Company to Governmental
Authorities in connection with the import thereof has been true and correct in
all material respects. No issues have been raised with the Affiliated Company by
any Governmental Authority that are currently pending in connection with any
customs entry or any export transaction or relating to any audit, examination,
or investigation of the Affiliated Company's import or export activities. There
are no unresolved issues or unpaid deficiencies, fines or penalties relating to
any audit, examination, or investigation of the Affiliated Company's customs
entries or export transactions. All of the Affiliated Company's exports have
been made in accordance with U.S. export controls laws. The Affiliated Company


                                       32


is not subject to any governmental action that would bar it from exporting or
otherwise limit its exporting activities.

3.27 Legal Proceedings. Except as disclosed in Section 3.27 of the Affiliated
Company Disclosure Schedule, there is no claim, charge, demand, inquiry,
investigation, action, suit, arbitration, or other legal proceeding pending or,
to the Knowledge of the Affiliated Company, threatened by or against the
Affiliated Company. No claim, charge, demand, inquiry, investigation, action,
suit, arbitration, or other legal proceeding disclosed in Section 3.27 of the
Affiliated Company Disclosure Schedule concerns the ownership or other rights
with respect to the Affiliated Company Shares. The claims, charges, demands,
inquiries, investigations, actions, suits, arbitrations, and other legal
proceedings disclosed in Section 3.27 of the Affiliated Company Disclosure
Schedule, in the aggregate, could not reasonably be expected to have a Material
Adverse Effect. During the past three years, to the Knowledge of the Affiliated
Company, it has not been the target or subject of any audit, inspection,
inquiry, investigation, survey, or other form of review by any Governmental
Authority, industry or trade association, professional review organization,
accrediting organization, or certifying agency relating to any actual or alleged
improper activity on the part of the Affiliated Company or any of its officers
or directors. No such reviews are pending, and to the Knowledge of the
Affiliated Company, none are threatened.

3.28 Certain Payments. Neither the Affiliated Company nor any Person associated
with or acting for or on behalf of the Affiliated Company has, directly or
indirectly, (a) made any contribution, gift, bribe, rebate, payoff, influence
payment, kickback, or other payment, whether in the form of money, property, or
services, to any Person, private or public, (i) to obtain favorable treatment in
securing business or to compensate for favorable treatment for business secured,
(ii) to obtain special concessions or to compensate for special concessions
obtained, or (iii) in violation of any applicable Law, or (b) established or
maintained any fund or asset that is not recorded in the books and records of
the Affiliated Company.

3.29 No Broker's Commission. No broker's commission, finder's fee, investment
banker's fee, or other similar payment is or will become payable by the
Affiliated Company or GraphOn pursuant to any Contract entered into by the
Affiliated Company as a result of or in connection with entering into this
Agreement or consummating the transactions contemplated hereby.

3.30 Disclosure. The information that the Affiliated Company will supply in
writing to GraphOn specifically for use in the Prospectus will not contain any
untrue statement of a material fact or omit to state a material fact necessary
in order to make the statements made therein, in the light of the circumstances
under which they will be made, not misleading.

ARTICLE IV

                  REPRESENTATIONS AND WARRANTIES OF GRAPHON

      GraphOn represents and warrants, as to itself and all the GraphOn
Subsidiaries (in which case the term "GraphOn" shall mean GraphOn and all the
GraphOn Subsidiaries, except with respect to Sections 4.3, 4.4, 4.5, and 4.6(b))
to the Affiliated Companies as follows:

                                       33


4.1 Incorporation. GraphOn is a corporation duly incorporated, validly existing,
and in good standing under the Laws of the jurisdiction of its incorporation.
GraphOn will make available to the Affiliated Companies complete and correct
copies of its certificate of incorporation and bylaws, each as amended to date.
GraphOn's certificate of incorporation and bylaws so made available are in full
force and effect.

4.2 Foreign Qualification. GraphOn is duly qualified to conduct business as a
foreign corporation and is in good standing under the Laws of each jurisdiction
where the ownership or operation of its properties and assets or the conduct of
its business requires such qualification, except where the lack of such
qualification would not have a Material Adverse Effect.

4.3 Corporate Power and Authority. GraphOn has corporate power and authority to
carry on the businesses in which it is engaged and to own and use the properties
owned and used by it. Each of GraphOn and the Acquisition Subsidiaries has
corporate power and authority to enter into this Agreement, to perform its
obligations hereunder, and to consummate the transactions contemplated by this
Agreement.

4.4 Authorization. The board of directors of each of GraphOn and the Acquisition
Subsidiaries has duly authorized the execution and delivery of this Agreement,
the performance of its obligations hereunder, and the consummation of the
transactions contemplated hereby. GraphOn, as the sole stockholder of each
Acquisition Subsidiary, has duly adopted this Agreement. Except as disclosed in
Section 4.4 of the GraphOn Disclosure Schedule, each of GraphOn and the
Acquisition Subsidiaries has taken all corporate actions necessary to authorize
the execution and delivery of this Agreement, the performance of its obligations
hereunder, and the consummation of the transactions contemplated hereby.

4.5 Execution, Delivery, and Enforceability. This Agreement has been executed
and delivered by a duly authorized officer of GraphOn and each Acquisition
Subsidiary, constitutes a legal, valid, and binding obligation of GraphOn and
each Acquisition Subsidiary, and is enforceable against GraphOn and each
Acquisition Subsidiary in accordance with its terms.

                                       34


4.6   Capitalization.
      --------------

(a)   The authorized  capital stock of GraphOn  consists  solely of 45,000,000
      shares of  common  stock,  par value  $.0001  per  share  (the  "GraphOn
      Shares"),   of  which   17,226,004   GraphOn   Shares   are  issued  and
      outstanding,  and 5,000,000  shares of preferred  stock,  par value $.01
      per share,  of which none are  issued  and  outstanding.  All the issued
      and  outstanding  GraphOn  Shares have been duly  authorized and validly
      issued and are fully paid and  nonassessable.  All the GraphOn Shares to
      be  issued  in  the  Mergers  have  been  duly   authorized   and,  upon
      consummation of the Mergers in accordance  with this Agreement,  will be
      validly issued,  fully paid, and  nonassessable.  None of the issued and
      outstanding  GraphOn Shares (i) was  offered or sold in violation of any
      provision of the  Securities  Act or (ii) was issued in violation of any
      preemptive  rights or any  similar  rights  that  entitle  any Person to
      acquire any GraphOn  Shares upon the issuance or sale  thereof.  None of
      the  Merger  Shares  (i) will  be offered  or sold in  violation  of any
      provision of the  Securities  Act or (ii) will be issued in violation of
      any  preemptive  rights or any similar rights that entitle any Person to
      acquire any GraphOn  Shares upon the  issuance or sale  thereof.  Except
      as disclosed in Section 4.6 of the GraphOn  Disclosure  Schedule,  there
      are no authorized or outstanding  Derivative  Securities of GraphOn that
      are  convertible  into or  exercisable or  exchangeable  for any GraphOn
      Shares or other shares of capital stock or  securities  of GraphOn,  and
      there are no  preemptive  or other  authorized  or  outstanding  rights,
      options,   warrants,   calls,   redemption   rights,   purchase  rights,
      subscription  rights,  conversion  rights,  exchange  rights,  or  other
      contracts or  commitments  to which GraphOn is a party or by which it is
      bound providing for the issuance,  transfer,  sale, or other disposition
      of any GraphOn  Shares or other shares of capital stock or securities of
      GraphOn.  There are no authorized  or  outstanding  stock  appreciation,
      phantom stock, profit  participation,  or similar rights with respect to
      the  GraphOn  Shares  or other  shares  of  capital  stock  of  GraphOn.
      GraphOn  has  no   outstanding   bonds,   debentures,   notes  or  other
      obligations  the  holders  of which  have the right to vote (or that are
      convertible  into or  exercisable  for  securities  having  the right to
      vote) with the stockholders of GraphOn on any matter.

(b)   The only GraphOn  Subsidiaries  as of the date hereof are Sub I, Sub II,
      Sub III, and GraphOn Limited,  an entity organized under the laws of the
      United  Kingdom.  The authorized  capital stock of Sub I consists solely
      of 10,000  shares of common  stock,  par value $.01 per share,  of which
      100 shares are issued and outstanding.  The authorized  capital stock of
      Sub II consists solely of 10,000 shares of common stock,  par value $.01
      per  share,  of  which  100  shares  are  issued  and  outstanding.  The
      authorized  capital stock of Sub III consists solely of 10,000 shares of
      common stock,  par value $.01 per share,  of which 100 shares are issued
      and  outstanding.  The  authorized  capital  stock  of  GraphOn  Limited
      consists  solely of 1,000 shares of common stock,  par value GBP1.00 per
      share, of which 2 shares are issued and  outstanding.  The capital stock
      of Sub I,  Sub  II,  Sub  III,  and  GraphOn  Limited  are  referred  to
      collectively  herein as the "GraphOn  Subsidiary Shares." All the issued
      and outstanding  GraphOn Subsidiary Shares have been duly authorized and
      validly  issued,  are  fully  paid and  nonassessable,  and are owned of
      record and  beneficially  by GraphOn and are owned free and clear of any
      Encumbrance  other  than  a  Permitted  Lien.  None  of the  issued  and
      outstanding  GraphOn  Subsidiary  Shares  (i) was  offered  or  sold  in


                                       35


      violation of any provision of the  Securities  Act or (ii) was issued in
      violation of any  preemptive  rights or any similar  rights that entitle
      any Person to acquire any GraphOn  Subsidiary  Shares upon the  issuance
      or sale  thereof.  There are no  authorized  or  outstanding  Derivative
      Securities  of any  GraphOn  Subsidiary  that  are  convertible  into or
      exercisable or exchangeable for any GraphOn  Subsidiary  Shares or other
      securities  of the GraphOn  Subsidiary,  and there are no  preemptive or
      other  authorized  or  outstanding  rights,  options,  warrants,  calls,
      redemption  rights,  purchase rights,  subscription  rights,  conversion
      rights,  exchange rights, or other contracts or commitments to which any
      GraphOn  Subsidiary is a party or by which it is bound providing for the
      issuance,   transfer,   sale,  or  other   disposition  of  any  GraphOn
      Subsidiary Shares or other securities of the GraphOn  Subsidiary.  There
      are no authorized or  outstanding  stock  appreciation,  phantom  stock,
      profit  participation,  or similar  rights  with  respect to any GraphOn
      Subsidiary  Shares.  No  Acquisition   Subsidiary  has  any  outstanding
      bonds,  debentures,  notes,  or other  obligations  the holders of which
      have the right to vote (or that are convertible  into or exercisable for
      securities  having the right to vote) with the  stockholders  of GraphOn
      on any matter.

4.7 Notices, Filings, and Approvals. Except as disclosed in Section 4.7 of the
GraphOn Disclosure Schedule, no notice to, filing with, or approval,
authorization, consent, order, or other action by, any Person is required of
GraphOn for the execution and delivery of this Agreement, the performance of its
obligations hereunder, or the consummation of the transactions contemplated
hereby.

4.8 Compliance. GraphOn is in compliance with all the provisions of (a) its
certificate of incorporation and bylaws, (b) all applicable Laws, (c) all
permits, approvals, authorizations, certificates of convenience or necessity,
licenses, privileges, and registrations necessary for the ownership of its
assets and properties and the conduct of its business, (d) all judgments,
decrees, orders, writs, injunctions, and other rulings of all Governmental
Authorities, and other authorities having jurisdiction over GraphOn or any of
its properties, assets, or operations, and (e) all Contracts to which GraphOn is
a party or is otherwise bound, except in the case of clauses (b), (c) and (e)
for such instances of non-compliance that in the aggregate have not had and
could not reasonably be expected to have a Material Adverse Effect. GraphOn has
not received any written notice or communication of any material failure to
comply with any of the foregoing that has not been cured (as evidenced by a
written notice to such effect, a copy of which has been provided to the
Affiliated Companies) as of the date hereof. GraphOn has all permits, licenses,
variances, exemptions, orders, and other governmental authorizations, consents,
and approvals necessary to conduct its business as presently conducted, except
for those the absence of which would not be reasonably likely to result in a
Material Adverse Effect. In the past three years, GraphOn has not had any
license, certificate of authority, or permit revoked nor has it had any
Governmental Authority deny any of its applications for a license, permit, or
certificate of authority, except for those revocations or denials that have not
had or could not reasonably be expected to have a Material Adverse Effect.

4.9 Noncontravention. Neither the execution or delivery by GraphOn of this
Agreement, nor the performance by GraphOn of its obligations hereunder, nor the
consummation of the transactions contemplated hereby, does or will, whether with


                                       36


or without the giving of notice or the passage of time or both, (a) result in
any violation of or conflict with any provision of (i) the certificate of
incorporation or bylaws of GraphOn, (ii) any applicable Law, (iii) any permit,
approval, authorization, certificate of convenience or necessity, license,
privilege, or registration necessary for the ownership of GraphOn's assets and
properties and the conduct of its business, or (iv) any judgment, decree, order,
writ, injunction, or other ruling of any Governmental Authority, or other
authority having jurisdiction over GraphOn or any of its properties, assets, or
operations, (b) conflict with, result in a breach of, constitute a default or
event of default under, result in the acceleration of performance under, result
in the termination of, loss of a material benefit under, or create in any party
the right to accelerate, terminate, cancel, or modify, any provision of any
Contract to which GraphOn is a party or is otherwise bound, or (c) result in the
imposition of any Encumbrance upon any assets or properties of GraphOn.

4.10 Investments. Except for the GraphOn Subsidiaries named in the SEC Reports
or in Section 4.6(b) hereof, GraphOn has no Subsidiaries and does not own of
record or beneficially any capital stock or other securities of, or any other
equity or proprietary interest in, any other Person.

4.11 SEC Reports. GraphOn has filed with the SEC all reports and materials
(including the related schedules and exhibits thereto) required to be filed by
it under the Exchange Act since January 1, 2000 (collectively, the "SEC
Reports"). Each SEC Report, as of its respective filing date, complied in all
material respects with the Exchange Act. None of the SEC Reports, as of their
respective filing dates, contained any untrue statement of a material fact or
omitted to state a material fact necessary in order to make the statements made
therein, in light of the circumstances under which they were made, not
misleading.

4.12 Financial Statements. The audited and unaudited consolidated financial
statements of GraphOn, including the related notes and schedules thereto,
included in the SEC Reports filed by GraphOn with the SEC since January 1, 2002
(the "GraphOn Financial Statements") have been prepared in accordance with GAAP
applied on a consistent basis throughout the respective periods covered thereby
and with the applicable provisions of the Exchange Act, and present fairly, in
all material respects, the consolidated financial position of GraphOn as of the
respective dates thereof and the consolidated results of operations, changes in
shareholders' equity, and cash flows of GraphOn for the respective periods
covered thereby. As of their respective dates, the GraphOn Financial Statements
did not, or do not, as the case may be, contain any untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary to make the statements made therein, in light of the circumstances in
which they were made, not misleading.

4.13 No Undisclosed Liabilities. GraphOn has no material Liabilities, except for
(a) the Liabilities reflected or reserved against in the most recent GraphOn
Financial Statements and (ii) current Liabilities incurred in the ordinary
course of business since the date of the most recent GraphOn Financial
Statement.

4.14 Accounting Controls. GraphOn maintains a system of internal accounting
controls sufficient to provide reasonable assurances that (a) transactions are
executed in accordance with management's general or specific authorization, (b)


                                       37


transactions are recorded as necessary to permit the preparation of financial
statements in conformity with GAAP and to maintain accountability for assets,
(c) access to assets is permitted only in accordance with management's general
or specific authorization, and (d) the recorded accountability for assets is
compared with the existing assets at reasonable intervals and appropriate action
is taken with respect to any differences.

4.15 Off-Balance-Sheet Transactions. There are no transactions, arrangements, or
other relationships between and/or among GraphOn, any of its Affiliates, and any
unconsolidated entity, including, without limitation, any structural finance,
special purpose, or limited purpose entity.

4.16 Related-Party Transactions. Except as disclosed in Section 4.16 of the
GraphOn Disclosure Schedule, there are no transactions or business relationships
between GraphOn and any Related Party. GraphOn is not a party to or bound by any
Contract with any Related Party. GraphOn has no Liability to any Related Party,
or vice versa, arising from or in connection with any such transaction or
business relationship. No Related Party owns or leases any assets or properties
of GraphOn.

4.17 Absence of Certain Developments. Except as disclosed in the SEC Reports or
in Section 4.17 of the GraphOn Disclosure Schedule, since the date of the
balance sheet comprising a portion of the most recent GraphOn Financial
Statements (the "GraphOn Balance Sheet Date,") there has not been any state of
facts, change, circumstance, development, or event that has had or would
reasonably be expected to have a Material Adverse Effect on GraphOn. In
particular, since the GraphOn Balance Sheet Date through the date hereof,
GraphOn has not:

(a)   conducted  its  business   outside  the  ordinary   course  of  business
      consistent with past practice;

(b)   made or suffered any material change in the nature or conduct of its
      business, regardless of whether such change has had or could reasonably be
      expected to have a Material Adverse Effect;

(c)   received notice that any of its suppliers or customers intends to alter
      the amount of business conducted with GraphOn or to cease conducting
      business with GraphOn altogether, which alteration or cessation of
      business would have a Material Adverse Effect;

(d)   entered into,  amended in any material  respect,  or terminated in whole
      or in material part any material GraphOn Contract;

(e)   (i) made or incurred any capital expenditure, except in the ordinary
      course of business consistent with past practice, or (ii) made or incurred
      any capital expenditure in excess of $50,000 in the aggregate;

(f)   sold, assigned, licensed, exchanged, leased, transferred or otherwise
      disposed of any of its assets or properties, other than for a fair


                                       38


      consideration and except in the ordinary course of business consistent
      with past practice with suitable replacements being obtained therefor to
      the extent necessary to operate the business;

(g)   suffered any material damage to or destruction or loss of any of its
      assets or properties, regardless of whether such damage, destruction, or
      loss was covered by insurance;

(h)   purchased, leased, or otherwise acquired any assets or properties, except
      in the ordinary course of business consistent with past practice;

(i)   (i) incurred any Liability to any Person, except in the ordinary course of
      business consistent with past practice, or (ii) incurred any Liability to
      any Person involving actual or potential aggregate future payments by
      GraphOn in excess of $100,000;

(j)   borrowed  any money or issued any  bonds,  debentures,  notes,  or other
      instruments evidencing borrowed money;

(k)   paid,  discharged,  or satisfied any of its  Liabilities,  except in the
      ordinary course of business consistent with past practice;

(l)   failed to pay, discharge, or satisfy any of its Liabilities when due and
      payable or materially delayed doing any of the foregoing, except for such
      Liabilities that it believes in good faith are not owed and do not exceed,
      individually or in the aggregate, $10,000;

(m)   received   notice  that  any  Person  party  thereto  has   accelerated,
      terminated, modified, or cancelled any material GraphOn Contract;

(n)   made any loan or advance of money to any Person in an amount in excess of
      $5,000 or made loans or advanced money to Persons in the aggregate in
      excess of $25,000;

(o)   compromised,  canceled,  waived, or released any material claim or right
      of GraphOn or any material Liability of any other Person;

(p)   received  notice that any material  Liability has been asserted  against
      GraphOn;

(q)   subjected  any of its  assets or  properties,  or  permitted  any of its
      assets or  properties  to be subjected  to, any  Encumbrance  except for
      Permitted Liens;

(r)   increased by more than 5% the total annual cash compensation payable to
      any employee whose total annual cash compensation prior to such increase
      was less than $50,000;

                                       39


(s)   made any material change in the employment terms of any director, officer,
      or employee outside the ordinary course of business consistent with past
      practice;

(t)   (i) adopted, established, amended, or terminated any Employee Benefit
      Plan, or (ii) paid any amount or provided any benefit under any Employee
      Benefit Plan, except in the ordinary course of business consistent with
      past practice;

(u)   (i) experienced any labor organizational effort, strike,  organized work
      stoppage or interruption,  or organized work slowdown, (ii) received any
      written claim or grievance,  unfair labor practice  charge or complaint,
      charge of discrimination,  or occupational health and safety citation or
      complaint  involving any present or former  employee or other  personnel
      retained by GraphOn other than routine individual  grievances,  or (iii)
      experienced  any change in its employee  relations that has had or could
      reasonably be expected to have a Material Adverse Effect;

(v)   (i) amended or authorized amendment of its certificate of incorporation or
      bylaws, or (ii) rescinded or modified or authorized rescission or
      modification of any resolutions adopted by its board of directors or
      stockholders;

(w)   (i)  changed its  authorized  capital  stock,  (ii)  effected  any stock
      split,  reverse  stock split,  or other  recapitalization  affecting its
      capital stock,  (iii) issued or sold or otherwise disposed of any of its
      capital stock,  options,  warrants,  calls,  or other rights to purchase
      capital  stock,  any securities  convertible  into or  exchangeable  for
      capital  stock,  or  other  securities,  or  (iv)  purchased,  redeemed,
      retired,  or  otherwise  acquired  any of its  capital  stock  or  other
      securities;

(x)   declared,  paid, or set aside for payment any dividends,  distributions,
      or payments on its capital stock (whether in cash or in kind);

(y)   (i) changed any of its accounting methods,  principles,  assumptions, or
      practices,  or (ii)  written  up,  down,  or off the value of any of its
      assets;

(z)   (i) failed to pay when due any premium with respect to any insurance
      policy covering GraphOn or its business, assets, properties, directors,
      officers, or employees, or (ii) canceled or failed to renew any such
      insurance policy; or

(aa)  agreed, committed, or otherwise arranged to take or suffer the taking of
      any action described in this Section 4.17, regardless of whether such
      agreement, commitment, or other arrangement is oral, written or otherwise.

4.18 Title to, and Sufficiency of, Assets. Except as disclosed in the SEC
Reports, GraphOn has full legal and beneficial title to or a valid license or
leasehold interest in all the assets and properties owned or used by it and
reflected on the most recent GraphOn Financial Statement (including, without
limitation, all furniture, fixtures, fixed assets, equipment, personal property,
real property, leasehold interests and improvements, cash and cash equivalents,


                                       40


accounts receivable, notes receivable, negotiable instruments, chattel paper,
deposits, inventory, Contract interests, GraphOn Intellectual Property, computer
software (including source codes), permits, business books and records, business
materials, corporate books and records, tax credits and refunds, and insurance
policies and rights with respect thereto), free and clear of all Encumbrances
except for Permitted Liens. Such assets constitute substantially all the assets
and properties necessary to conduct its business as currently conducted.

4.19 Condition of Assets. All assets and properties owned or used by GraphOn in
the conduct of its business are in good condition and working order, ordinary
wear and tear excepted, and are suitable for the purposes for which they are
currently used.

4.20 Intellectual Property. Except as disclosed in Section 4.20 of the GraphOn
Disclosure Schedule, GraphOn represents and warrants that it owns, or has other
legitimate and recognized proprietary rights in, all the Intellectual Property
necessary to conduct GraphOn's business as currently conducted. GraphOn warrants
that all rights in the GraphOn Intellectual Property are valid and subsisting.
GraphOn has taken all commercially reasonable measures to protect its rights
with respect to its GraphOn Intellectual Property, including those measures
required by Law. All maintenance, annuity, renewal, and other fees required to
be paid by GraphOn as of the date hereof with respect to the registration and
protection of its GraphOn Intellectual Property have been timely paid. To its
Knowledge, GraphOn is not required to pay any royalty, honorarium, fee, or other
amount to any Person for its use of any non-proprietary GraphOn Intellectual
Property. GraphOn has no Knowledge that its use of any of the GraphOn
Intellectual Property infringes or has infringed any Intellectual Property right
of any Person, or that it has, through such use, misappropriated or improperly
used or disclosed any Intellectual Property of any Person. There is no pending
or, to the Knowledge of GraphOn, threatened claim, charge, demand, inquiry,
investigation, action, suit, arbitration, or other legal proceeding relating to
any of the GraphOn Intellectual Property. Following the Mergers, GraphOn will
continue to own or have the uninterrupted right to use the GraphOn Intellectual
Property pursuant to the same terms and conditions existing on the date hereof.

4.21 Contracts. Except as disclosed in the SEC Reports or in Section 4.21 of the
GraphOn Disclosure Schedule, GraphOn is not a party to or bound by any of the
following Contracts (collectively, the "GraphOn Contracts"):

(a)   Contract that is not in the ordinary course of business;

(b)   Contract that (i) involves or could reasonably be expected to involve
      aggregate future payments by GraphOn in excess of $50,000 and (ii) is not
      terminable by GraphOn within 90 days after giving notice to the other
      party to the Contract without any penalty, premium, or continuing
      Liability being imposed on GraphOn;

(c)   Contract with any Related Party;

(d)   Contract for the sale, assignment, license, exchange, lease, transfer, or
      other disposition of any of its assets or properties, other than for a
      fair consideration and except in the ordinary course of business
      consistent with past practice;

                                       41


(e)   Contract for the purchase, lease, or other acquisition of any assets or
      properties, except in the ordinary course of business consistent with past
      practice;

(f)   Contract for the merger, consolidation,  recapitalization,  or any other
      reorganization of GraphOn, except for this Agreement;

(g)   Contract for the borrowing of money from any Person;

(h)   Contract for the lending or advancing of money to any Person;

(i)   Contract with any Governmental Authority;

(j)   Contract for the employment of any Person (other than employment that is
      terminable at will) or for consulting, contracting, agency, or other
      similar services by any Person in excess of $50,000;

(k)   Contract  relating to the  termination  of any  Person's  employment  or
      providing  severance or other  post-termination  benefits in  connection
      therewith;

(l)   Contract  with any labor  union,  including  any  collective  bargaining
      agreement;

(m)   Contract  that limits the right of GraphOn to engage in any  business or
      to compete with any Person;

(n)   Contract that is in violation of Law or the  performance  of which is or
      would be in violation of Law;

(o)   Contract that requires the  approval,  authorization,  or consent of any
      party thereto to the  consummation of the  transactions  contemplated by
      this Agreement; or

(p)   any other Contract the  performance of which involves  consideration  in
      excess of $50,000.

GraphOn will provide access, upon request, to true and complete copies of all of
the GraphOn Contracts to the Affiliated Companies prior to the date hereof. Each
GraphOn Contract was entered into on the basis of arms-length negotiations
between GraphOn and each other party thereto. Each GraphOn Contract is as of the
date hereof, and will continue to be following the consummation of the Mergers,
valid, in full force and effect, and enforceable against each other party
thereto in accordance with its terms. There is no conflict, disagreement, or
dispute regarding any GraphOn Contract between GraphOn and any other party
thereto, which if unresolved would have or could reasonably be expected to have
a Material Adverse Effect. GraphOn has not threatened, and has no Knowledge that
any other party has threatened, to cancel any GraphOn Contract. There is no
breach or default under any GraphOn Contract by GraphOn or any other party
thereto, which if not cured would have or could reasonably be expected to have a
Material Adverse Effect. Except as disclosed in Section 4.21 of the GraphOn


                                       42


Disclosure Schedule, no act, omission, event, development, condition, or
circumstance known to GraphOn has occurred or is existing that, with or without
the giving of notice or the passage of time or both, would become or result in
any breach or default under any GraphOn Contract by GraphOn or any other party
thereto, which if not cured would have or could reasonably be expected to have a
Material Adverse Effect. GraphOn has not released or waived any material right
or remedy under any GraphOn Contract. GraphOn is not subject to any material
legal obligation, and has no Knowledge that any other party has any legal right,
to materially renegotiate any GraphOn Contract. GraphOn has no Knowledge of any
pending or threatened bankruptcy, insolvency, or similar proceeding with respect
to any other party to the GraphOn Contracts.

4.22 Taxes. Except as disclosed in Section 4.22 of the GraphOn Disclosure
Schedule, all Tax Returns required to be filed by GraphOn with all taxing
authorities on or before the date hereof have been timely filed. All such filed
Tax Returns have been prepared in accordance with all applicable Laws and
correctly reflect in all material respects the facts regarding GraphOn's income,
business, assets, operations, activities, and status and all other information
required to be shown thereon as of the date of filing. GraphOn has timely paid
all Taxes shown on the books and records of GraphOn to be due and reflected on
such filed Tax Returns. GraphOn has timely made all required deposits and
estimated payments with respect to accrued Taxes as of the date of such
statements. The reserves for Taxes contained in the most recent GraphOn
Financial Statement are adequate to cover all accrued and unpaid Taxes as of the
date hereof. GraphOn has withheld or collected from each payment made to each of
its employees the amount of all Taxes required to be withheld or collected
therefrom, and GraphOn has paid the same to the appropriate taxing authority or
depository. GraphOn (a) has not been audited by any taxing authority, (b) has no
Knowledge that any taxing authority is contemplating an audit, (c) has not
received from any taxing authority any written notice of deficiencies,
adjustments, assessments, or other charges with respect to Taxes paid or
payable, or (d) made any payment, or provided any benefit, to any present or
former director, officer, or employee that is not allowable as a deduction under
the Code. No extension of time for the filing of Tax Returns or the payment of
Taxes by GraphOn is in effect on the date hereof.

4.23 Insurance. All Insurance Policies to which GraphOn is a party or under
which it is covered as of the date of this Agreement are disclosed in Section
4.23 of the GraphOn Disclosure Schedule, and GraphOn will provide access upon
request to true and complete copies of all such Insurance Policies (and
correspondence relating to coverage thereunder) and of all pending applications
for Insurance Policies to the Affiliated Companies prior to the date hereof.
Each of the Insurance Policies to which GraphOn is a party or that provides
coverage to it as of the date hereof, and will continue to be following the
consummation of the Mergers, valid, in full force and effect, and enforceable in
accordance with its terms. GraphOn has paid all premiums and other costs with
respect to each Insurance Policy to which it is a party or that provides
coverage to it and has otherwise performed all of its obligations under each
such Insurance Policy. All such Insurance Policies, taken together, provide
adequate insurance coverage for the business, assets, properties, and employees
of GraphOn for all risks normally insured against by a Person carrying on the
same business as GraphOn in locations in which GraphOn's business is conducted,
and such Insurance Policies are sufficient for compliance with all Laws
applicable to GraphOn and with all GraphOn Contracts. There is no claim insured
under any such Insurance Policy of which GraphOn has not properly and timely


                                       43


notified the applicable insurer. There is no pending claim filed by GraphOn
under any such Insurance Policy as to which the insurer has denied coverage or
is defending under a reservation of rights. GraphOn has not received (a) any
refusal of coverage, or any notice that a defense will be afforded with
reservation of rights or (b) any notice of cancellation or any other indication
that any Insurance Policy is no longer in full force or effect or that the
applicable insurer is not willing or able to perform its obligations thereunder.
GraphOn is not obligated under any Contract to provide insurance coverage to any
third party (including Related Parties).

4.24 Employment and Labor. GraphOn is not delinquent in the payment of any
wages, salaries, commissions, bonuses, reimbursements, or other compensation
payable to any of its present or former employees. The employment of each
employee of GraphOn is terminable at will without any cost or Liability to
GraphOn, except for the payment of accrued wages, salaries, commissions,
bonuses, reimbursements, and other compensation and the provision of benefits
under the Employee Benefit Plans. GraphOn has no Knowledge that any of its
directors, officers, or other management-level employees intends to terminate
his or her employment with GraphOn, except as contemplated by this Agreement.
GraphOn is in compliance with all applicable Laws relating to employment and
employment practices, terms and conditions of employment, wages and hours,
occupational health and safety, and the employment of non-residents, except for
such instances of non-compliance that in the aggregate have not had and could
reasonably be expected not to have a Material Adverse Effect. Except as
disclosed in section 4.24 of the GraphOn Disclosure Schedule, there is no
outstanding and unresolved written claim or grievance, unfair labor practice
charge or complaint, charge of discrimination, or health and safety citation or
complaint involving any present or former employee or other personnel retained
by GraphOn other than routine individual grievances. There is no pending or, to
the Knowledge of GraphOn, threatened claim, charge, demand, inquiry,
investigation, action, suit, arbitration, or other legal proceeding concerning
GraphOn's employment practices. GraphOn is not a party to any collective
bargaining agreement or other Contract with any labor union and has not received
written notice of any labor organizational efforts with respect to its
employees. GraphOn has not experienced any strike, organized work stoppage or
interruption, or organized work slowdown by its employees during the last three
years.

4.25  Employee Benefit Plans.
      ----------------------

(a)   All  Employee  Benefit  Plans  maintained  or  operated by GraphOn or an
      ERISA  Affiliate  of GraphOn  or under  which it has any  Liability  are
      disclosed  in  the  SEC  Reports  or in  Section  4.25  of  the  GraphOn
      Disclosure  Schedule.  Section 4.25 of the GraphOn  Disclosure  Schedule
      contains a true and complete  list of all employee  handbooks,  manuals,
      brochures,  publications  or  similar  documents  of  GraphOn  regarding
      office  administration,   personnel  matters  and  hiring,   evaluation,
      supervision,   training,  termination  and  promotion  of  employees  of
      GraphOn,  including  but not  limited to  GraphOn's  affirmative  action
      plan,  if any,  and all  communications  to  employees  concerning  such
      matters  ("Personnel  Documents").  GraphOn will furnish,  upon request,
      to  the  Affiliated  Companies  true  and  correct  copies  of  all  the
      documents  listed in Section  4.25 of the GraphOn  Disclosure  Schedule.
      The  Affiliated  Companies  will be provided  access,  upon request,  to
      true,  complete and correct copies of the  following:  (i) each Employee


                                       44


      Benefit Plan, and a written summary of any Employee  Benefit Plan not in
      writing,  (ii) all  collective  bargaining  agreements,  (iii)  the most
      recent  determination letter received from the Internal Revenue Service,
      (iv)  the most  recent  application  for  determination  filed  with the
      Internal  Revenue  Service,  (v) the summary  plan  description  and all
      summaries of material  modifications and all material  communications to
      employees  with respect to any  Employee  Benefit  Plan,  (vi) the three
      most recent  annual  reports on Internal  Revenue  Service  Form 5500 or
      5500C for each Employee  Benefit Plan including  Schedule A and Schedule
      B thereto (except in the case of an Employee  Benefit Plan that has been
      in  existence  for less than 5 years,  in which case,  for as long as it
      has been in existence),  (vii) actuarial reports, if applicable, and the
      most recent periodic  accounting of related plan assets,  and (viii) all
      related trust  agreements,  annuity  contracts,  insurance  contracts or
      other funding  arrangements  which implement any Employee  Benefit Plan,
      and  (ix) in  the case of stock  options  or stock  appreciation  rights
      issued under any Employee  Benefit Plan which is a stock option or stock
      appreciation  rights plan, a list of holders,  dates of grant, number of
      shares,  exercise  price per share and dates  exercisable,  and (x) each
      Personnel Document.

(b)   GraphOn has received a current favorable  determination  letter for each
      Employee  Benefit Plan intended to be qualified  under Section 401(a) of
      the  Code.  No  act,  omission,   event,   development,   condition,  or
      circumstance  known to GraphOn has  occurred  or is existing  that would
      cause any Employee  Benefit Plan to become  disqualified for purposes of
      Section  401(a)  of the Code.  Each  trust  intended  to  qualify  under
      Section  501(c)(9) of the Code so  qualifies  in form and in  operation,
      meets  the   requirements   of  Section  505(c)  of  the  Code  and  the
      regulations  thereunder,  and has  received  an opinion  letter from the
      Internal  Revenue  Service that such trust so qualifies,  and no fact or
      event has  occurred  since the date of any  opinion  letter  which could
      affect adversely the exempt status of any such trust.

(c)   Neither GraphOn nor any of its officers or directors, has taken any action
      directly or indirectly which obligates GraphOn to institute or modify or
      change any Employee Benefit Plan, any actuarial or other assumption used
      to calculate funding obligations with respect to any of GraphOn's Employee
      Benefit Plans, or the manner in which contributions to any of the Employee
      Benefit Plans are made or the basis on which such contributions are
      determined.

(d)   GraphOn is, and each Employee  Benefit Plan is maintained  and operated,
      in compliance  with all  applicable  Laws  relating to Employee  Benefit
      Plans  (including,  without  limitation,  Section 401(a) of the Code and
      ERISA) and all the terms of such Employee Benefit Plan,  except for such
      instances  of  non-compliance  that in the  aggregate  have  not had and
      could  reasonably  be expected  not to have a Material  Adverse  Effect.
      GraphOn has not incurred any  Liability to the IRS, the DOL, or the PBGC
      in  connection  with any  Employee  Benefit  Plan.  With respect to each
      Employee  Benefit  Plan (i) no  prohibited  transaction  as  defined  in
      Section  406 of ERISA or  Section  4975 of the Code has  occurred,  (ii)
      neither  GraphOn nor any of its current or former  directors,  officers,
      employees or any other "fiduciary,"  within the meaning of Section 3(21)
      of ERISA, has committed any breach of fiduciary  responsibility  imposed


                                       45


      by ERISA or any other  applicable  Law, or has any Liability for failure
      to comply  with  ERISA or the Code for any  action or  failure to act in
      connection  with the  administration  or investment of the assets of any
      Employee  Benefit Plan, and there is no pending,  or to the Knowledge of
      GraphOn, threatened or anticipated action, suit, grievance,  arbitration
      or other manner of litigation  or claim under any Employee  Benefit Plan
      or  with  respect  to the  assets  thereof,  or by or on  behalf  of any
      current  or former  director,  officer  or  employee,  or  dependent  or
      beneficiary  thereof,  or  otherwise  (other  than  routine  claims  for
      benefits where the plan's  administrative  claims  procedure has not yet
      been  exhausted),  including  but  not  limited  to  any  action,  suit,
      grievance,  arbitration or other manner of litigation or claim regarding
      conduct which  allegedly  interferes with the attainment of rights under
      any  Employee  Benefit  Plan,  (iii)  neither  GraphOn  nor  any  of its
      directors or officers or any fiduciary of any Employee  Benefit Plan has
      any  Knowledge  of any facts  which  could give rise to  arbitration  or
      other manner of  litigation  or claims with respect  thereto  except for
      such instances of non-compliance  that in the aggregate have not had and
      could reasonably be expected not to have a Material Adverse Effect.

(e)   All reports and descriptions of the Employee Benefit Plans (including,
      without limitation, IRS Form 5500 annual reports, summary annual reports,
      and summary plan descriptions) required to be filed by GraphOn with the
      IRS, the DOL, or the PBGC on or before the date hereof have been timely
      filed, and as appropriate, have been timely provided to the participants
      in the Employee Benefit Plans.

(f)   There is no pending or, to the Knowledge of GraphOn, threatened claim,
      charge, demand, inquiry, investigation, action, suit, arbitration, or
      other legal proceeding relating to any Employee Benefit Plan, except for
      claims for benefits thereunder made in the ordinary course.

(g)   The  consummation  of the  transactions  contemplated  by this Agreement
      will not  accelerate  the time of vesting or payment,  or  increase  the
      amount,  of the  compensation  or benefits to be paid or provided to any
      present  or former  officer or  employee  of  GraphOn.  No  Contract  or
      Employee  Benefit  Plan  provides  for any "excess  parachute  payment,"
      within the meaning of Section  4999 of the Code,  upon or in  connection
      with  the  consummation  of  the   transactions   contemplated  by  this
      Agreement.

(h)   GraphOn has not been liable at any time for contributions to any Employee
      Benefit Plan that is or was subject to Title IV of ERISA.

(i)   GraphOn or an ERISA  Affiliate of GraphOn,  as applicable,  has made all
      contributions  required  to be made by it  pursuant  to the terms of any
      Employee  Benefit Plan or any collective  bargaining  agreement to which
      it is a party or as otherwise  required by applicable  Law. With respect
      to each  Employee  Benefit  Plan,  subject to only normal  retrospective
      adjustments in the ordinary course,  all insurance  premiums,  including
      premiums to the PBGC,  have been paid in full for policy  years or other
      applicable  policy periods ending on or prior to the date hereof.  There
      exists  no  "accumulated  funding  deficiency"  within  the  meaning  of
      Section 302 of ERISA and Section  412 of the Code,  with  respect to any
      Employee  Benefit Plan,  regardless of whether such  deficiency has been
      waived.

                                       46


(j)   GraphOn  does  not  have,  and  the  consummation  of  the  transactions
      contemplated  by this  Agreement  will not result in, any  Liability for
      (a) any minimum funding  contribution  required under Section 302(c)(11)
      of ERISA or Section  412(c)(11) of the Code,  (b) any  payment  required
      under  Section  302(e) of ERISA or Section  412(m) of the Code,  (c) any
      lien  imposed  under  Section  302(f) of ERISA or Section  412(n) of the
      Code, (d) any excise tax imposed with respect to an accumulated  funding
      deficiency  under Section 4971 of the Code,  (e) the  termination  of or
      withdrawal  from any plan under Sections  4062,  4063, or 4064 of ERISA,
      or (f) the withdrawal  from any  multi-employer  plan under Section 4201
      of ERISA.

(k)   No  Employee  Benefit  Plan is (i) a  "multiemployer  plan"  within  the
      meaning  of  Section  3(37) or  Section  4001(a)(3)  of ERISA or Section
      414(f)  of the  Code,  (ii) a  "multiple  employer  welfare  plan"  or a
      "multiple  employer welfare  arrangement"  within the meaning of Section
      514(b)(6) of ERISA,  or a "welfare  benefit  fund" within the meaning of
      Section  419(e)  of the  Code.  GraphOn  has not  incurred  and does not
      expect to incur  any  withdrawal  Liability  (either  as a  contributing
      employer or as part of a controlled  group which includes a contributing
      employer) to any multiemployer  plan, in connection with any complete or
      partial  withdrawal  from such plan  occurring  on or before the Closing
      Date  or  as a  result  of  the  transactions  contemplated  under  this
      Agreement.

(l)   No  Employee  Benefit  Plan  provides  medical,  life or  other  welfare
      benefits  (whether or not  insured),  with  respect to current or former
      employees after  retirement or other  termination of service (other than
      coverage  mandated by applicable  Law).  With respect to any Contract or
      arrangement  with an  insurance  company  providing  funding  under  any
      Employee  Benefit Plan,  there is no Liability for any retroactive  rate
      adjustment.   GraphOn   has  the  right  to  amend  or   terminate   its
      participation   with  respect  to  each  Employee   Benefit  Plan.  Each
      Employee  Benefit Plan that is a "group health plan," within the meaning
      of  Section  5000 of the Code  has  been  operated  in  compliance  with
      Section  4980B of the Code or Sections  601 through 608 of ERISA and the
      secondary  payor  requirements of Section 1862(b) of the Social Security
      Act.  No  claim  for  medical   benefits  has  been  incurred  (but  not
      reported)  under any  Employee  Benefit Plan with respect to any current
      or former  employee (or the spouse of dependent of such employee)  which
      is in excess of $25,000.

(m)   The total aggregate potential maximum liability for the entire current
      fiscal year and any remaining earned but unpaid amounts for prior fiscal
      years under any cash bonus plan listed in Section 4.25 of the GraphOn
      Disclosure Schedule is $81,000, of which 0% has been accrued as a
      Liability on the balance sheet of GraphOn as of June 30, 2002. GraphOn has
      continued to accrue since June 30, 2002 all amounts payable pursuant to
      any cash bonus plan in accordance with its past practice.

4.26  Environmental Matters.
      ---------------------

(a)   GraphOn and its business are in compliance in all material respects
      with all applicable Environmental Laws in connection with the
      ownership, operation and condition of its properties (whether owned or


                                       47


      leased), assets, and business and have all permits, licenses,
      approvals, and other such authorizations from Governmental Authorities
      to operate its business in full compliance with Environmental Law, and,
      as of the date of this Agreement, neither GraphOn nor its business has
      received any notice, order or directive from any Governmental Authority
      alleging a violation of any Environmental Law.

(b)   To the Knowledge of GraphOn:

(i)   There are no Contaminants located on, contained in, or otherwise part
      of GraphOn's properties (whether owned or leased), assets, or business
      other than in accordance with applicable Law that will require any
      investigation or remediation, and there has not been any past or ongoing
      release of Contaminants into the environment on, from, within or onto any
      locations where wastes from the operation of any its properties (whether
      owned or leased), assets, or business in each case except where same
      would not have a Material Adverse Effect;

(ii)  There are no PCBs that are located on, contained in or otherwise a part of
      its properties (whether owned or leased), assets, or business;

(iii) No Person may have suffered any injury or incurred any damage of any type
      whatsoever as the result of the release of or exposure to Contaminants
      from its properties (whether owned or leased), assets, or business; and

(iv)  There are no locations where Contaminants from the operation of its
      properties (whether owned or leased), assets, or business have been
      stored, treated, or recycled or disposed of, other than in accordance with
      applicable Law, other than as would not have a Material Adverse Effect.

(c)   There are no underground or above ground storage tanks located upon any of
      GraphOn's properties (whether owned or leased) or assets.

(d)   Neither GraphOn nor its business has received, as of the date of this
      Agreement, any written directive, order or notice from any Governmental
      Authority or any other Person alleging that either GraphOn or its
      business is actually or potentially liable under any Environmental Law
      for the costs of investigation or remediation of any properties
      (whether owned or leased) or other real property to which Contaminants
      generated in connection with GraphOn's business were transferred.
      Copies of any environmental investigations, studies, audits, tests,
      reviews, or analyses relating to any properties (whether owned or
      leased) conducted by or on behalf of GraphOn or provided by any of its
      predecessors to GraphOn within the last five (5) years, will be
      furnished to the Affiliated Companies upon request.

4.27 Legal Proceedings. Except as disclosed in the SEC Reports or in Section
4.27 of the GraphOn Disclosure Schedule, there is no claim, charge, demand,
inquiry, investigation, action, suit, arbitration, or other legal proceeding
pending or, to the Knowledge of GraphOn, threatened by or against GraphOn. No
claim, charge, demand, inquiry, investigation, action, suit, arbitration, or


                                       48


other legal proceeding disclosed in Section 4.27 of the GraphOn Disclosure
Schedule concerns the ownership or other rights with respect to the GraphOn
Shares. The claims, charges, demands, inquiries, investigations, actions, suits,
arbitrations, and other legal proceedings disclosed in the SEC Reports or in
Section 4.27 of the GraphOn Disclosure Schedule, in the aggregate, could not
reasonably be expected to have a Material Adverse Effect. During the past three
years, to the Knowledge of GraphOn, it has not been the target or subject of any
audit, inspection, inquiry, investigation, survey, or other form of review by
any Governmental Authority, industry or trade association, professional review
organization, accrediting organization, or certifying agency relating to any
actual or alleged improper activity on the part of GraphOn or any of its
officers or directors. No such reviews are pending, and to the Knowledge of
GraphOn, none are threatened.

4.28 Certain Payments. Neither GraphOn nor any Person associated with or acting
for or on behalf of GraphOn has, directly or indirectly, (a) made any
contribution, gift, bribe, rebate, payoff, influence payment, kickback, or other
payment, whether in the form of money, property, or services, to any Person,
private or public, (i) to obtain favorable treatment in securing business or to
compensate for favorable treatment for business secured, (ii) to obtain special
concessions or to compensate for special concessions obtained, or (iii) in
violation of any applicable Law, or (b) established or maintained any fund or
asset that is not recorded in the books and records of GraphOn.

4.29 No Broker's Commission. Except as disclosed in Section 4.29 of the GraphOn
Disclosure Schedule, no broker's commission, finder's fee, investment banker's
fee, or other similar payment is or will become payable by GraphOn or any
Affiliated Company pursuant to any Contract entered into by GraphOn as a result
of or in connection with entering into this Agreement or consummating the
transactions contemplated thereby.

4.30 Disclosure. The Registration Statement, the Proxy Materials, and the
Prospectus will comply in all material respects with the requirements of the
Securities Act and the Exchange Act. The Registration Statement (at the time it
becomes effective under the Securities Act) and the Prospectus and the Proxy
Materials (at the time they are mailed to GraphOn stockholders and at the time
of the Special Meeting) will not contain any untrue statement of a material fact
or omit to state a material fact necessary in order to make the statements made
therein, in the light of the circumstances under which they will be made, not
misleading; provided, however, that GraphOn makes no representation or warranty
with respect to any information that the Affiliated Companies supply to GraphOn
specifically for use in the Prospectus.

ARTICLE V

                              PRE-CLOSING COVENANTS

      The Parties agree and covenant that, from the date of this Agreement and
until the Closing or earlier termination of this Agreement:

5.1 Conduct of Business. Each Party shall use commercially reasonable efforts to
maintain and improve its business, organization, and goodwill. Except as
contemplated by this Agreement, no Party shall take, or cause or allow to be
taken, any action described in clauses (a), (b), (d)-(f), (h)-(l), (n), (o),
(q)-(t), (v)-(z), and (aa) of Sections 3.16 and 4.17 hereof. Each Party shall


                                       49


use commercially reasonable efforts to preserve intact its current business
organization, keep available the services of its officers and employees and
maintain its relations and good will with suppliers, customers, landlords,
creditors, employees, and others having business relationships with it.

5.2 Access. Each Party shall permit each other Party and its Representatives to
have free and full access to all its premises, properties, employees and other
personnel, Contracts, and books and records, upon reasonable notice, during
regular business hours, and in a manner that does not unreasonably interfere
with the Party's normal business operations, so that the other Party, at its
sole expense, may have an opportunity to make such examinations, investigations,
and reviews as may be desired. Each Party shall cause its Representatives to
cooperate fully with, and to make full and prompt disclosure of all information
(including, without limitation, updated operating performance data and unaudited
financial statements and financial information) requested during, such
examinations, investigations, and reviews, provided, however, that no
investigation pursuant to this Section shall affect or be deemed to modify any
representation or warranty made by either Party and provided, further that the
foregoing shall not require either Party to permit any inspection, or to
disclose any information that in the reasonable judgment of the Party would
result in a violation of applicable Law or would result in the disclosure of any
trade secrets of third parties or violate any of the Party's obligations with
respect to confidentiality if the Party shall have used commercially reasonable
efforts to obtain the consent of such thrid party to such inspection or
disclosure.

5.3 Notices, Filings, and Approvals. As soon as reasonably practicable after the
date hereof, each Party shall give all notices to, make all filings with, and
use its commercially reasonable efforts to obtain all approvals, authorizations,
consents, orders, and other actions by, all Persons that are required to be
given, made, or obtained by the Party for the performance of its obligations
hereunder and the consummation of the transactions contemplated hereby. Each
Party shall cooperate with each other Party to the extent reasonably practicable
to secure such requisite approvals, authorizations, consents, orders, or other
actions.

5.4 Registration Statement and Proxy Statement/Prospectus. As soon as reasonably
practicable after the date hereof, GraphOn shall prepare and file with the SEC a
registration statement under the Securities Act (together with any amendments or
supplements thereto, the "Registration Statement"), including a proxy statement
(together with a form of proxy and soliciting materials for the Special Meeting
and any amendments or supplments thereto, the "Proxy Materials") and prospectus
(together with any amendments or supplements thereto, the "Prospectus"),
providing for the registration under the Securities Act of the Merger Shares.
The Proxy Materials shall contain the GraphOn Board of Directors' recommendation
to GraphOn stockholders to approve the Mergers, unless the Board of Directors of
GraphOn determines in good faith upon consultation with its legal counsel that
it may not make such recommendation in order to comply with its fiduciary duties
under applicable Law. The Registration Statement shall comply in all material
respects with the requirements of the applicable SEC form and shall include all
information, financial statements, financial statement schedules, and exhibits
required by the SEC to be included therein. The Affiliated Companies shall
provide GraphOn with such information to be included in the Registration
Statement as GraphOn may reasonably request. GraphOn shall use commercially
reasonable efforts to respond as expeditiously as possible to any and all


                                       50


comments made by the SEC staff with respect to the Registration Statement, Proxy
Materials, and Prospectus and to have the Registration Statement declared
effective by the SEC as soon as reasonably practicable after it is filed with
the SEC. As soon as reasonably practicable after the Registration Statement
becomes effective, GraphOn shall mail the Proxy Materials to the stockholders of
GraphOn who are entitled to vote at the Special Meeting and shall mail the
Prospectus to the stockholders of the Affiliated Companies. GraphOn shall make
any and all filings and take any and all other actions that may be necessary,
appropriate, or advisable under the applicable state securities laws in
furtherance of the offer and sale of the Merger Shares.

5.5 Fairness Opinion. As soon as reasonably practicable after the date hereof,
GraphOn shall secure a written opinion of Pacific Crest Securities, Inc. or
another nationally recognized investment banking firm reasonably acceptable to
GraphOn and the Affiliated Companies to the effect that the Cortelco Conversion
Ratio, the CIDCO Conversion Ratio, and the SLL Conversion Ratio are collectively
fair to the stockholders of GraphOn from a financial point of view (the
"Fairness Opinion"). The Fairness Opinion, in written form, shall be merely a
confirmation of the oral Fairness Opinion rendered to GraphOn immediately prior
to the date hereof.

5.6 Special Meeting. As soon as reasonably practicable after the date that the
Proxy Materials are first mailed to the GraphOn stockholders, and in no event
later than 60 days thereafter, GraphOn shall hold a special meeting in lieu of
an annual meeting of its stockholders (the "Special Meeting") to consider and
vote upon (a) the approval of an amendment to its certificate of incorporation
effecting the Reverse Stock Split in accordance with Section 242(b) of the
Delaware Law, and (b) the approval of the Mergers and of the resulting issuance
of the Merger Shares as required by Marketplace Rule 4350(i) issued by the NASD
(collectively, the "Proposals").

5.7 Reverse Stock Split. The Parties contemplate that GraphOn will amend its
certificate of incorporation immediately prior to the consummation of the
Mergers to effect a reverse split of the issued and outstanding GraphOn Shares
so that the GraphOn Shares will meet the minimum bid price requirement for
initial inclusion on Nasdaq after the consummation of the Mergers (the "Reverse
Stock Split"). Should the GraphOn stockholders approve the amendment to the
GraphOn certificate of incorporation to effect the Reverse Stock Split, GraphOn
shall, as soon as reasonably practicable after the Special Meeting, amend its
certificate of incorporation to effect the Reverse Stock Split by preparing,
executing, and filing a certificate of amendment thereto with the office of the
Secretary of State of the State of Delaware. GraphOn shall take any and all
other actions that may be necessary, appropriate, or advisable to effect the
Reverse Stock Split or in furtherance thereof.

5.8 Nasdaq Initial Listing. Due to the probable treatment of the Mergers and
resulting issuance of the Merger Shares as a "Reverse Merger" under the NASD's
Marketplace Rule 4330(f), as soon as reasonably practicable after the date of
the filing of the Registration Statement with the SEC, GraphOn shall file an
initial listing application with Nasdaq for GraphOn as it shall be constituted
subsequent to the consummation of the Mergers. Each of GraphOn and the


                                       51


Affiliated Companies shall use their respective commercially reasonable efforts
to cause such application to be approved prior to the Closing Date.

5.9 Board of Directors of GraphOn. Immediately prior to the Closing Date, and
subject to and effective as of the consummation of the Mergers, (a) the board of
directors of GraphOn shall establish the number of directors constituting the
whole board of directors as seven, and (b) a sufficient number of directors
shall resign from the board of directors of GraphOn such that there will be four
vacancies thereon after giving effect to the foregoing change in the number of
directors constituting the whole board of directors.

5.10 Employment Agreements. As soon as reasonably practicable after the date
hereof, Cortelco shall use its commercially reasonable efforts to enter into,
subject to and effective as of the consummation of the Mergers, (a) an
Employment Agreement in substantially the form attached as Exhibit D to this
Agreement (the "Employment Agreement") with each of those persons listed on
Schedule 5.10 hereto (the "Key Employees").
5.11 Lock-Up Agreements. As soon as reasonably practicable after the date
hereof, each Affiliated Company shall use its commercially reasonable efforts to
cause its directors, officers, and stockholders listed on Schedule 5.11 hereto
to execute and deliver, on or before the Closing Date, a Lock-Up Agreement with
GraphOn as to the Merger Shares that each will receive in the Mergers in
substantially the form attached as Exhibit E hereto (the "Lock-Up Agreement").

5.12 Additional Funding. As soon as reasonably practicable after the date
hereof, each Party shall use its commercially reasonable efforts to obtain, on
or before the Closing Date, at least $5,000,000 in the aggregate in additional
debt or equity funding for the benefit of one or more Parties on terms and
conditions that are mutually satisfactory to the Parties.

5.13 Transfer of GraphOn's Assets and Liabilities. Immediately prior to the
Closing Date, and subject to and effective as of the consummation of the
Mergers, (a) GraphOn shall assign, convey, and transfer substantially all its
assets and properties (excluding the issued and outstanding GraphOn Subsidiary
Shares and its interest in and rights under this Agreement) to Sub IV, and (b)
Sub IV shall assume and agree to perform and discharge substantially all the
Liabilities of GraphOn relating to such transferred assets and properties
(excluding, without limitation, its Liabilities under this Agreement).

5.14 Distribution of Shares of Cortelco. Immediately prior to the Closing Date,
and subject to and effective as of the consummation of the Mergers, Cortelco
Systems Holding Corporation, a Delaware corporation and the sole stockholder of
Cortelco as of the date of this Agreement ("CSHC") will distribute all of its
shares of Cortelco to the recordholders of CSHC's common stock as of the date of
the distribution (the "CSHC Stockholders") The CSHC Stockholders will receive
one Cortelco Share for each share of common stock of CSHC held by the CSHC
Stockholders. In order to accomplish the distribution, Cortelco will amend its
Certificate of Incorporation prior to the distribution date to authorize
32,206,815 shares of common stock, and will issue sufficient shares to CSHC to
permit the distribution by CSHC to the CSHC Stockholders immediately prior to
the Closing Date.

                                       52


5.15 Non-Solicitation. After the date hereof and prior to the earlier of (a) the
last to occur of the Cortelco Effective Date, the CIDCO Effective Date, and the
SLL Effective Date or (b) the termination of this Agreement as provided in
Article VIII hereof, unless the Parties shall otherwise agree in writing,
neither Party shall initiate, solicit, negotiate, encourage, or provide
Confidential Information to facilitate, and each Party shall use its best
efforts to cause (i) any officer, director, or employee of such Party, (ii) any
attorney, accountant, or other Representative of such Party, or (iii) any
investment banker retained by such Party, not to initiate, solicit, negotiate,
encourage, or provide Confidential Information to facilitate, any proposal or
offer to acquire all or substantially all of the business and properties of such
Party, or capital stock of such Party, whether by merger, purchase of assets,
tender offer, or otherwise, whether for cash, securities, or any other
consideration or combination thereof (such transactions being referred to herein
as "Acquisition Transactions"); provided, however, that a Party may furnish
information concerning its business, properties, or assets to any person (a
"Potential Acquiror") if (A) the Party's board of directors determines that such
Potential Acquiror has the financial wherewithal to consummate an Acquisition
Transaction with the Party on terms that would yield a higher value to the
Party's stockholders than will the Mergers, and (B) after consultation with
counsel in the case of GraphOn, and after receiving a written opinion of counsel
in the case of an Affiliated Company, the Party's board determines that the
failure to provide such information would constitute a breach of its fiduciary
duty to the Party's stockholders. Upon receipt of a bona fide offer from a
Potential Acquiror proposing an Acquisition Transaction with a Party and
determination of the Party's board of directors that such offer will likely
yield a higher value to the Party's stockholders than would consummation of the
Mergers, a Party may, with respect to such Potential Acquiror, negotiate and
enter into a definitive agreement for an Acquisition Transaction with the
Potential Acquiror and take any of the other actions otherwise prohibited by
this Section 5.15.

5.16 Representations and Warranties; Covenants. Each Party shall use its
commercially reasonable efforts to ensure that (a) all representations and
warranties made by the Party in this Agreement are true and correct on and as of
the Closing Date, and (b) the Party performs and complies with all agreements,
covenants, and obligations contained in this Agreement that are to be performed
and complied with by the Party on or before the Closing Date.

5.17 Notice of Adverse Developments. Each Party shall give prompt written notice
to the other Parties in accordance with Section 9.5 hereof of the occurrence of
any act, omission, or event or the existence of any condition or circumstance
that has resulted or could reasonably be expected to result in (a) any
representation and warranty made by the Party in this Agreement being untrue or
incorrect or (b) the failure of the Party to perform or comply with any
agreement, covenant, or obligation contained in this Agreement that is to be
performed and complied with by the Party on or before the Closing Date;
provided, however, that no such notice by any Party shall be deemed to amend or
supplement the Affiliated Company Disclosure Schedule or the GraphOn Disclosure
Schedule, as applicable, or to prevent or cure any misrepresentation, breach of
warranty, or breach of covenant by the Party.

5.18 General. Without limiting the generality of the foregoing, each Party shall
use its commercially reasonable efforts to take, or cause to be taken, all


                                       53


actions and to do, or cause to be done, all things necessary, appropriate, or
advisable to consummate the transactions contemplated by this Agreement as soon
as possible.

ARTICLE VI

                       CONDITIONS TO OBLIGATIONS TO CLOSE

6.1 Conditions to Obligation of GraphOn. The obligation of GraphOn to consummate
the transactions contemplated by this Agreement is subject to the satisfaction,
on or before the Closing Date, of each of the following conditions, any one or
more of which may be waived by GraphOn except in the event that such condition
is a requirement of Law:

(a)   Representations  and  Warranties.  All  representations  and  warranties
      --------------------------------
      made by the Affiliated  Companies in this Agreement shall have been true
      and  correct in all  material  respects  when made and shall be true and
      correct in all  material  respects on and as of the  Closing  Date as if
      made  thereon,  except to the extent  that any such  representation  and
      warranty  is already  qualified  as to  materiality,  in which case such
      representation  and warranty shall be true and correct  without  further
      qualification.

(b)   Covenants. Each Affiliated Company shall have performed and complied with
      in all material respects all agreements, covenants, and obligations
      contained in this Agreement that are to be performed and complied with by
      the Affiliated Company on or before the Closing Date.

(c)   Certificate of President. GraphOn shall have received from each Affiliated
      Company a certificate of the President of the Affiliated Company, dated as
      of the Closing Date, as to the satisfaction of the conditions contained in
      Sections 6.1(a) and 6.1(b) hereof.

(d)   Notices,  Filings,  and  Approvals.  Each  Party  shall  have  given all
      ----------------------------------
      notices to, made all filings with, and obtained all material  approvals,
      authorizations,  consents,  orders,  and other  actions  by, all Persons
      that are  required to be given,  made,  or obtained by the Party for the
      performance of its  obligations  hereunder and the  consummation  of the
      transactions  contemplated  hereby.  Without  limiting the generality of
      the foregoing,  (i) the  stockholders of each  Affiliated  Company shall
      have duly  adopted  this  Agreement,  (ii) the  stockholders  of GraphOn
      shall have duly  approved the  Proposals at the Special  Meeting,  (iii)
      GraphOn  shall  have   effected  the  Reverse  Stock  Split,   (iv)  the
      Registration  Statement  shall have been declared  effective by the SEC,
      and no stop  order  shall  have  been  issued  by the SEC  with  respect
      thereto,  (v) the Merger  Shares shall have been approved for listing on
      Nasdaq,  subject  only to  official  notice  of  issuance,  and (vi) the
      Affiliated   Companies  shall  have  received,   in  a  form  reasonably
      satisfactory  to  GraphOn,  the  consent  required  under  the  Foothill
      Capital  Credit  Agreements   evidencing  consent  to  the  transactions
      contemplated by this Agreement.

(e)   Fairness Opinion. GraphOn shall have received the Fairness Opinion, which
      shall be reasonably satisfactory in form and substance to GraphOn, and the
      Fairness Opinion shall not have been withdrawn.

                                       54


(f)   No Adverse  Legal  Proceedings  or Rulings.  No inquiry,  investigation,
      ------------------------------------------
      action,  suit,  arbitration,  or other legal proceeding shall be pending
      before  any  Governmental  Authority,  or  other  authority  seeking  to
      restrain,  enjoin,  or otherwise prevent or hinder, or to obtain damages
      on account of, the  consummation  of the  transactions  contemplated  by
      this Agreement. No judgment,  decree, order, writ, injunction,  or other
      ruling by any Governmental  Authority,  or other authority  restraining,
      enjoining,  or otherwise preventing or hindering the consummation of the
      transactions  contemplated by this Agreement shall have been entered and
      be in effect.

(g)   No Material  Adverse  Effect.  No  Material  Adverse  Effect  shall have
      ----------------------------
      occurred  with  respect to either of Cortelco or CIDCO since the date of
      this Agreement.

(h)   Employment Agreement.  GraphOn shall have received a fully executed
      --------------------
      copy of an Employment Agreement from each of the Key Employees.

(i)   Lock-Up Agreements. GraphOn shall have received from each director,
      officer, and stockholder of the Affiliated Companies listed on Schedule
      5.11 hereto an executed Lock-Up Agreement.

(j)   Certificate of Secretary. GraphOn shall have received from each Affiliated
      Company a certificate of the Secretary of the Affiliated Company, dated as
      of the Closing Date, as to certain corporate matters.

(k)   Certification of Non-Foreign Status. GraphOn shall have received from each
      Affiliated Company a certificate of an authorized officer of the
      Affiliated Company, dated as of the Closing Date, as to its non-foreign
      status.

(l)   Legal Opinion. GraphOn shall have received a legal opinion, dated as of
      Closing Date, of Baker, Donelson, Bearman & Caldwell, counsel for the
      Affiliated Companies, in substantially the form attached as Exhibit F to
      this Agreement.

(m)   Documents. GraphOn shall have received from the Affiliated Companies all
      documents and instruments necessary to consummate the transactions
      contemplated by this Agreement and all such other documents, instruments,
      certificates, opinions, and other materials relating thereto as GraphOn
      may have reasonably requested, all of which shall be reasonably
      satisfactory in form and substance to GraphOn.

6.2 Conditions to Obligations of the Affiliated Companies. The obligation of
each Affiliated Company to consummate the transactions contemplated by this
Agreement is subject to the satisfaction, on or before the Closing Date, of each
of the following conditions, any one or more of which may be waived by the
Affiliated Company except in the event that such condition is a requirement of
Law:

(a)   Representations and Warranties. All representations and warranties made by
      GraphOn in this Agreement shall have been true and correct in all material


                                       55


      respects when made and shall be true and correct in all material respects
      on and as of the Closing Date as if made thereon, except to the extent
      that any such representation and warranty is already qualified as to
      materiality, in which case such representation and warranty shall be true
      and correct without further qualification.

(b)   Covenants. GraphOn shall have performed and complied with in all material
      respects all agreements, covenants, and obligations contained in this
      Agreement that are to be performed and complied with by GraphOn on or
      before the Closing Date.

(c)   Certificate of President. The Affiliated Company shall have received from
      GraphOn a certificate of the President of GraphOn, dated as of the Closing
      Date, as to the satisfaction of the conditions contained in Sections
      6.2(a) and 6.2(b) hereof.

(d)   Notices,  Filings,  and  Approvals.  Each  Party  shall  have  given all
      ----------------------------------
      notices to, made all filings with, and obtained all material  approvals,
      authorizations,  consents,  orders,  and other  actions  by, all Persons
      that are  required to be given,  made,  or obtained by the Party for the
      performance of its  obligations  hereunder and the  consummation  of the
      transactions  contemplated  hereby.  Without  limiting the generality of
      the foregoing,  (i) the  stockholders of each  Affiliated  Company shall
      have duly  adopted  this  Agreement,  (ii) the  stockholders  of GraphOn
      shall have duly  approved the  Proposals at the Special  Meeting,  (iii)
      GraphOn  shall  have   effected  the  Reverse  Stock  Split,   (iv)  the
      Registration  Statement  shall have been declared  effective by the SEC,
      and no stop  order  shall  have  been  issued  by the SEC  with  respect
      thereto,  and (v) the Merger Shares shall have been approved for listing
      on Nasdaq, subject only to official notice of issuance.

(e)   Inclusion in Nasdaq. GraphOn shall meet all the quantitative and
      qualitative requirements for initial inclusion on Nasdaq following the
      consummation of the Mergers.

(f)   No Adverse  Legal  Proceedings  or Rulings.  No inquiry,  investigation,
      ------------------------------------------
      action,  suit,  arbitration,  or other legal proceeding shall be pending
      before  any  Governmental  Authority,  or  other  authority  seeking  to
      restrain,  enjoin,  or otherwise prevent or hinder, or to obtain damages
      on account of, the  consummation  of the  transactions  contemplated  by
      this Agreement. No judgment,  decree, order, writ, injunction,  or other
      ruling by any Governmental  Authority,  or other authority  restraining,
      enjoining,  or otherwise preventing or hindering the consummation of the
      transactions  contemplated by this Agreement shall have been entered and
      be in effect.

(g)   No Material  Adverse  Effect.  No  Material  Adverse  Effect  shall have
      ----------------------------
      occurred with respect to GraphOn since the date of this Agreement.

(h)   Board of Directors of GraphOn. The board of directors of GraphOn shall
      have established the number of directors constituting the whole board of
      directors as seven, and a sufficient number of directors shall have
      resigned from the board of directors of GraphOn such that there are four


                                       56


      vacancies thereon after giving effect to the foregoing change in the
      number of directors constituting the whole board of directors.

(i)   Certificate of Secretary. The Affiliated Company shall have received from
      GraphOn a certificate of the Secretary of GraphOn, dated as of the Closing
      Date, as to certain corporate matters.

(j)   Legal Opinion. The Affiliated Company shall have received a legal opinion,
      dated as of Closing Date, of Sonnenschein Nath & Rosenthal, counsel for
      GraphOn, in substantially the form attached as Exhibit G to this
      Agreement.

(k)   Documents. The Affiliated Company shall have received from GraphOn all
      documents and instruments necessary to consummate the transactions
      contemplated by this Agreement and all such other documents, instruments,
      certificates, opinions, and other materials relating thereto as the
      Affiliated Company may have reasonably requested, all of which shall be
      reasonably satisfactory in form and substance to the Affiliated Company.

ARTICLE VII

                              POST-CLOSING MATTERS

7.1 Further Assurances. At any time and from time to time after the Closing
Date, the Parties shall execute and deliver such additional documents and
instruments and shall take such other actions as may be necessary, appropriate,
or advisable to consummate the transactions contemplated by this Agreement.

7.2 Filling Vacancies on Board of Directors of GraphOn. Immediately after the
Closing Date, the board of directors of GraphOn shall fill the vacancies on the
board of directors resulting from the actions described in Section 5.9 hereof
with the Persons listed in Schedule 7.2 to this Agreement who have been
designated by the Affiliated Companies to serve thereon.

ARTICLE VIII

                                   TERMINATION

8.1 Termination of Agreement. Notwithstanding anything herein or elsewhere to
the contrary, this Agreement may be terminated and the transactions contemplated
hereby may be abandoned at any time before the Closing as follows:

(a)   by the Parities in a written  agreement  executed  and  delivered by all
      the Parties;

(b)   by GraphOn, pursuant to a written notice given to each Affiliated Company,
      if any of the conditions set forth in Section 6.1 hereof has not been
      fulfilled or has become incapable of fulfillment on or before 5:00 p.m.
      (Pacific time) on December 31, 2002, except in the event that such


                                       57


      non-fulfillment is the result, directly or indirectly, of any act or
      omission by GraphOn that constitutes a material breach or default under
      this Agreement;

(c)   by any  Affiliated  Company,  pursuant  to a  written  notice  given to
      GraphOn and each other Affiliated  Company, if any of the conditions set
      forth in  Section  6.2  hereof  has not  been  fulfilled  or has  become
      incapable  of  fulfillment  on or  before  5:00 p.m.  (Pacific  time) on
      December 31, 2002, except in the event that such  non-fulfillment is the
      result,  directly  or  indirectly,   of  any  act  or  omission  by  the
      Affiliated  Company that  constitutes a material breach or default under
      this Agreement; or

(d)   By a Party under the circumstances contemplated by Section 5.15.

8.2 Effect of Termination. If any Party terminates this Agreement pursuant to
Section 8.1 hereof, this Agreement shall be of no further force or effect and
all rights and Liabilities of the Parties hereunder shall terminate, except (a)
that Sections 9.1, 9.2, and 9.3 hereof shall survive such termination and remain
in full force and effect as provided therein and (b) for any Liability of any
Party for any breach or default under this Agreement.

ARTICLE IX

                                  MISCELLANEOUS

9.1   Confidentiality.
      ---------------

(a)   Except as may be  required  by Law or legal  process,  each  Party  (the
      "Receiving Party") and its  Representatives  shall treat  confidentially
      and  not  disclose  any  Confidential  Information  received  from or on
      behalf of any other  Party  (the  "Disclosing  Party").  Notwithstanding
      the  foregoing,  the  Receiving  Party  may  disclose  any  Confidential
      Information to its  Representatives  who need to know such  Confidential
      Information  for the purpose of evaluating the Disclosing  Party and the
      transactions   contemplated  by  this   Agreement,   provided  that  the
      Receiving  Party,  before making any such  disclosure,  (i) informs each
      Representative   of  the   confidential   nature  of  the   Confidential
      Information and the existence of this Section 9.1 and  (ii) obtains  the
      written agreement of such Representative  (other than any Representative
      who is a director,  officer or employee of the Receiving Party), in form
      and substance  satisfactory to the Disclosing  Party, to the effect that
      such  Representative  shall be bound by all the  covenants  made by, and
      all the  obligations  imposed on, the  Receiving  Party in this  Section
      9.1;  provided,  however,  that  no  such  written  agreement  shall  be
      required   for  any   Representative   that  is   already   party  to  a
      confidentiality  agreement  with  substantially  similar  terms with the
      Receiving Party that covers the Confidential Information,  or where such
      Representative owes a professional  obligation of confidentiality to the
      Receiving Party.

(b)   If the Receiving Party or any of its Representatives becomes aware of any
      prohibited disclosure or misappropriation of any Confidential Information
      or any other breach of the provisions of this Section 9.1, the Receiving
      Party shall promptly notify the Disclosing Party thereof.

                                       58


(c)   If the Receiving Party or any of its Representatives  receives a request
      or becomes legally compelled (by deposition,  interrogatory, request for
      documents, subpoena,  investigation,  demand, order, or similar process)
      to  disclose  any  Confidential   Information,   then  before  any  such
      disclosure is made,  the Receiving  Party shall  (i) immediately  notify
      the Disclosing  Party thereof,  (2) consult with the Disclosing Party on
      the  advisability of taking steps to resist or narrow such request,  and
      (3) reasonably  cooperate  with the  Disclosing  Party in any attempt to
      obtain a protective order or other appropriate  remedy or assurance that
      the Confidential  Information will be afforded  confidential  treatment.
      Any  expenses  incurred  by the  Receiving  Party  as a  result  of such
      cooperation  shall be paid by the Disclosing  Party.  If such protective
      order or other appropriate  remedy is not obtained,  the Receiving Party
      or  such   Representative   shall  furnish  only  that  portion  of  the
      Confidential  Information  that  it is  advised  by  its  outside  legal
      counsel is legally required to be furnished.

(d)   If this  Agreement is terminated  for any reason,  the  Receiving  Party
      shall,  and shall  cause its  Representatives  to,  promptly  return all
      Confidential   Information   and  all   copies,   extracts,   and  other
      reproductions thereof to the Disclosing Party;  provided,  however, that
      the   Receiving   Party  and  its   Representatives   may   destroy  any
      Confidential  Information of the type described in clause (b) of Section
      1.26  hereof  in lieu of  returning  the same to the  Disclosing  Party,
      provided  that such  destruction  shall be  certified  in writing to the
      Disclosing  Party by a duly  authorized  officer of the Receiving  Party
      who supervised such destruction.

(e)   Notwithstanding anything herein or elsewhere to the contrary, this Section
      9.1 and the rights and Liabilities of the Parties hereunder shall survive
      the termination of this Agreement for any reason for a period of three
      years after the date of such termination.

9.2 Fees and Expenses. Each Party shall be responsible for and pay all fees and
expenses (including, without limitation, financial advisors', attorneys',
accountants' and other professional fees and expenses) incurred by the Party in
connection with, relating to, or arising out of the negotiation, execution, and
delivery of this Agreement and all other documents and instruments contemplated
herein, the performance of the Party's obligations hereunder and thereunder, and
the consummation of the transactions contemplated hereby. Notwithstanding
anything herein or elsewhere to the contrary, this Section 9.2 and the rights
and Liabilities of the Parties hereunder shall survive the termination of this
Agreement for any reason.

9.3 Public Disclosures. Except as otherwise required by applicable Laws or rules
or regulations of any stock exchange, all press releases, publicity, and other
public disclosures concerning the transactions contemplated by this Agreement
shall be made only upon the prior agreement of all the Parties; provided,
however, that this Section 9.3 shall not apply to communications made by any
Party with its Representatives. In the case of any such public disclosure that
is required by applicable Laws or rules or regulations of any stock exchange,
the disclosing Party shall, prior to making such disclosure, give the other
Parties a reasonable opportunity to review and comment upon the disclosure,
consult with the other Parties regarding the disclosure, and attempt in good
faith to agree with the other Parties with respect to the disclosure.


                                       59


Notwithstanding anything herein or elsewhere to the contrary, this Section 9.3
and the rights and Liabilities of the Parties hereunder shall survive the
termination of this Agreement for any reason.

9.4 Entire Agreement. This Agreement, including the attached schedules and
exhibits (which are incorporated herein), constitutes the full understanding of
the Parties, a complete allocation of risks among them, and a complete and
exclusive statement of the terms and conditions of their agreement relating to
the subject matter hereof and supersedes any and all prior negotiations,
understandings and agreements, whether written or oral, among the Parties,
including, without limitation, the Term Sheet dated May 13, 2002, among GraphOn,
CIDCO, and Cortelco.

9.5 Notices. All notices required or permitted to be given hereunder shall be
made in writing and may be delivered by the United States mail, hand, facsimile,
or a nationally recognized delivery service. Notices delivered by the United
States mail shall be deemed given three Business Days after being deposited in
the mail, postage prepaid, registered or certified mail, and return receipt
requested. Notices delivered by hand, facsimile, or a nationally recognized
delivery service shall be deemed given upon receipt; provided, however, that a
notice delivered by facsimile shall be effective only if such notice is also
delivered by hand or is deposited in the United States mail, postage prepaid,
registered or certified mail, and return receipt requested, on or before two
Business Days after delivery by facsimile. All notices shall be addressed as
follows:

            If to GraphOn or any
            Acquisition Subsidiary: GraphOn Corporation, or
                                    GraphOn Via Sub I Inc., or
                                    GraphOn Via Sub II Inc., or
                                    GraphOn Via Sub III Inc.
                                    63 Geoffroy Drive
                                    Santa Cruz, CA 95062
                                    Attention:  Robert P. Dilworth
                                    Telecopier:  (831)462-9675

                  with a copy to:   Sonnenschein Nath & Rosenthal
                                    1221 Avenue of the Americas
                                    24th Floor
                                    New York, NY 10020-1089
                                    Attention:  Ira I. Roxland
                                    Telecopier:  (212) 768-6800

            If to any Affiliated
            Company:                Cortelco, Inc., or
                                    CIDCO Communications Corporation, or
                                    SLL Communications Corporation
                                    105 Cochrane Circle
                                    Morgan Hill, CA 95037
                                    Attention:  Steve Bowling
                                    Telecopier:  (408) 782-8230

                                       60


                  with a copy to:   Baker, Donelson, Bearman & Caldwell, PC
                                    165 Madison Avenue, Suite 2000
                                    Memphis, TN  38103
                                    Attention:  Jackie Prester
                                    Telecopier:  (901) 577-0762

Any Party may change its address for the purposes of notice hereunder by
notifying the other Parties thereof in accordance with the provisions of this
Section 9.5.

9.6   Enforceability.  This Agreement  shall be enforceable by and against the
      --------------
Parties and their respective successors and permitted assigns.

9.7 Assignment. No Party shall assign, convey, transfer, or otherwise dispose of
any or all of its interest in, or any or all of its rights and Liabilities
under, this Agreement without the prior written consent of all the other
Parties. Any such assignment, conveyance, transfer, or other disposition made or
attempted in breach of this Section 9.7 shall be null and void and of no force
or effect.

9.8 Amendments. This Agreement may be altered, amended, modified or changed
(other than any waiver which shall be effective only if made in accordance with
Section 9.9 hereof) only by a written agreement executed by all the Parties.

9.9 Waiver. No provision of this Agreement may be waived by any Party unless
such waiver is set forth in writing and executed by the waiving Party. The
waiver of any breach or default under any provision of this Agreement shall not
be deemed to constitute a waiver of any other breach or default under the same
or any other provision of this Agreement.

9.10 Modification and Severability. If a court of competent jurisdiction
declares that any provision of this Agreement is illegal, invalid or
unenforceable, such provision shall be modified automatically to the extent
necessary to make such provision fully legal, valid or enforceable. If such
court does not modify any such provision as contemplated herein, but instead
declares it to be wholly illegal, invalid or unenforceable, such provision shall
be severed from this Agreement, this Agreement and the rights and obligations of
the Parties shall be construed as if this Agreement did not contain such severed
provision, and this Agreement otherwise shall remain in full force and effect.

9.11 Headings. The section headings contained in this Agreement are inserted for
convenience only and shall not affect in any way the meaning or interpretation
of this Agreement.

9.12 Construction. The Parties have participated jointly in the negotiation and
drafting of this Agreement. In the event that any ambiguity or question of
intent or interpretation arises, this Agreement shall be construed as if drafted
jointly by the Parties, and no presumption or burden of proof shall arise
favoring or disfavoring any Party by virtue of the authorship of any of the
provisions of this Agreement.

                                       61


9.13 Governing Law. This Agreement shall be governed and controlled as to
validity, enforcement, interpretation, construction, effect and in all other
respects by the internal Laws of the State of Delaware applicable to contracts
made in that state, without regard to any choice or conflict of laws provisions,
principles, or rules (whether of the State of Delaware or any other
jurisdiction) that would cause the application of the Laws of any jurisdiction
other than the State of Delaware.

9.14 Multiple Counterparts. This Agreement may be executed by the Parties in one
or more counterparts, each of which shall be deemed an original for all
purposes, and all of which together shall constitute one and the same
instrument.



                                       62




      IN WITNESS WHEREOF, the Parties have executed and delivered this Agreement
as of the date first written above.



GRAPHON CORPORATION                      CORTELCO, INC.


By:    /s/ Robert Dilworth               By:   /s/ James Hopper
       ----------------------------            --------------------------------
Name:  Robert Dilworth                   Name:  James Hopper
       ----------------------------            --------------------------------
Title: President                         Title: President
       ----------------------------            --------------------------------


GRAPHON VIA SUB I INC.                   CIDCO COMMUNICATIONS CORPORATION


By:    /s/ Robert Dilworth               By:   /s/ Ian Laing
       ----------------------------            --------------------------------
Name:  Robert Dilworth                   Name:  Ian Laing
       ----------------------------            --------------------------------
Title: President                         Title: President
       ----------------------------            --------------------------------


GRAPHON VIA SUB II INC.                  SLL COMMUNICATIONS CORPORATION


By:    /s/ Robert Dilworth               By:   /s/ Ian Laing
       ----------------------------            --------------------------------
Name:  Robert Dilworth                   Name:  Ian Laing
       ----------------------------            --------------------------------
Title: President                         Title: President
       ----------------------------            --------------------------------


GRAPHON VIA SUB III INC.


By:    /s/ Robert Dilworth
       ----------------------------
Name:  Robert Dilworth
       ----------------------------
Title: President
       ----------------------------