STOCKHOLDERS AGREEMENT


                          Dated as of October 23, 1998



                                      Among



                               MLC HOLDINGS, INC.

                         AND CERTAIN OF ITS STOCKHOLDERS










                                      -iii-
DOCUMENT3
                                                  TABLE OF CONTENTS

                                                                    Page

Section 1.        Definitions.......................................-1-

Section 2.        Voting Arrangements...............................-7-
         (a)      Election of Directors.............................-7-
         (b)      Additional Directors..............................-7-
         (c)      Removal of Directors..............................-8-
         (d)      Vacancies.........................................-8-
         (e)      Rights Unimpaired.................................-8-
         (f)      APPOINTMENT OF PROXY..............................-8-
         (g)      Committees........................................-9-
         (h)      Stock Purchase Warrant............................-9-
         (i)      Initial Thayer Directors..........................-9-
         (j)      Fiduciary Duties Unchanged........................-9-
         (k)      Election of Subsidiaries' Directors...............-9-

Section 3.        Restrictions on Transfer..........................-9-
         (a)      Restrictions on Transfer..........................-9-
         (b)      Certain Permitted Transfers......................-10-
         (c)      Tag-Along Rights.................................-12-
         (d)      Public Thayer Offer..............................-14-
         (e)      Transfers in Violation of this Agreement.........-14-

Section 4.        Legends..........................................-14-
         (a)      Stockholders Agreement Legend....................-14-
         (b)      Removal of Legends...............................-15-

Section 5.        Preemptive Rights................................-15-
         (a)      Restrictions.....................................-15-
         (b)      Thayer Offer.....................................-15-
         (c)      Stock Offer......................................-15-
         (d)      Refused Securities...............................-16-
         (e)      Exclusions.......................................-16-
         (f)      Excluded Securities..............................-16-
         (g)      33.3% Limitation.................................-16-

Section 6.        Qualified Sale of the Company....................-17-
         (a)      Approved Sale....................................-17-
         (b)      Management Offer.................................-17-

Section 7.        Registration Rights..............................-19-
         (a)      Shelf Registration...............................-19-
         (b)      Demand Registration..............................-19-
         (c)      Incidental Registration..........................-19-
         (d)      Holdback Agreements..............................-20-
         (e)      Registration and Maintenance Procedures..........-21-
         (f)      Registration Expenses............................-24-
         (g)      Indemnification; Contribution....................-25-
         (h)      Rule 144 Sales...................................-28-
         (i)      Underwritten Registrations.......................-28-
         (j)      No Inconsistent Agreements.......................-28-
         (k)      S-3 Demands......................................-28-

Section 8.        Operating Budget.................................-29-

Section 9.        Redemption.......................................-29-

Section 10.       Rights of First Refusal or First Offer...........-30-
         (a)      Assignment.......................................-30-
         (b)      Irrevocable Proxy and Stock Rights Agreement.....-30-

Section 11.       Amendment and Waiver.............................-30-

Section 12.       Severability.....................................-31-

Section 13.       Entire Agreement.................................-31-

Section 14.       Successors and Assigns...........................-31-

Section 15.       Counterparts.....................................-31-

Section 16.       Remedies.........................................-31-

Section 17.       Notices..........................................-31-

Section 18.       Governing Law....................................-32-

Section 19.       Descriptive Headings.............................-33-

Section 20.       Survival; Termination............................-33-

Section 21.       Other Registration Rights........................-33-








Schedules and Exhibits:

Schedule I      --.......Other Management Stockholders
Exhibit A       --.......Form of Joinder Agreement to Stockholders Agreement








DOCUMENT3

                             STOCKHOLDERS AGREEMENT


                  This STOCKHOLDERS  AGREEMENT (this "Agreement") is dated as of
October 23,  1998 among (i) MLC  HOLDINGS,  INC.,  a Delaware  corporation  (the
"Company"),   (ii)  TC  Leasing,  LLC,  a  Delaware  limited  liability  company
("Thayer"),  (iii)  Phillip G. Norton  ("Norton"),  Bruce M. Bowen and the other
Persons   listed  on   Schedule   I  hereto   (collectively,   the   "Management
Stockholders") and (iv) each Person who hereafter executes a counterpart of this
Agreement (or otherwise  agrees to be bound by the provisions  hereof).  Thayer,
the Management Stockholders and the other Persons that are or may become parties
to  this  Agreement  are  sometimes  referred  to  herein  collectively  as  the
"Stockholders").

                  The parties hereby agree as follows:

                  Section 1.......Definitions.  For purposes of this Agreement,
the following terms have the indicated meanings:

                  "Affiliate"  of a Person means any other  Person  controlling,
controlled by or under common control with such Person,  whether by ownership of
voting  securities,  by contract or  otherwise,  and in the case of Thayer shall
include Thayer Equity Investors III, L.P. and any of its partners or Affiliates,
and in the case of a natural  Person shall  include any member of such  Person's
Family Group.

                  "Agreement" is defined in the preface.

                  "Allocable Shares" is defined in Section 3(c)(ii).

                  "Approved Sale" is defined in Section 6(a).

                  "Block of Shares" means Thayer  Shares which  constitute 5% or
more of the Common  Shares of the Company,  and includes all Thayer Shares which
are  transferred  pursuant  to  Section  3(b)(vi)  or  3(b)(xiii)  in  a  single
transaction or in a series of related transactions.

                  "Board" means the Company's Board of Directors.

                  "Buyers" is defined in Section 6(b).

                  "Common Shares" means shares of the Company's Common Stock.

                  "Common  Stock"  means,  collectively,  the  Company's  common
stock,  par value $.01 per share,  and any other  class or series of  authorized
capital  stock of the Company  which is not limited to a fixed sum or percentage
of par or stated  value in  respect  to the  rights of the  holders  thereof  to
participate in dividends or in the  distribution of assets upon any liquidation,
dissolution or winding up of the Company.









                                      
DOCUMENT3
                  "Common  Stock  Purchase  Agreement"  means the  Common  Stock
Purchase Agreement,  dated as of the date hereof, by and between the Company and
Thayer.

                  "Company" is defined in the preface.

                  "Co-Redemption Notice" is defined in Section 9.

                  "Demand Registration" is defined in Section 7(b)(i).

                  "Demand Right" is defined in Section 7(b)(i).

                  "Exchange Act" means the Securities Exchange Act of 1934, .
                   as amended

                  "Excluded Securities" is defined in Section 5(f).

                  "Family   Group"  means  such   Person's   spouse  and  lineal
descendants  (whether  natural or adopted) and any trust  formed and  maintained
solely for the benefit of such Person,  such  Person's  spouse or such  Person's
lineal descendants.

                  "Incidental Registration" is defined in Section 7(c)(i).

                  "Incidental Registration Statement" is defined in Section 7(c)
                   (i).

                  "Indemnified Company" is defined in Section 7(g)(ii).

                  "Indemnified Parties" is defined in Section 7(g)(ii).

                  "Indemnified Stockholder" is defined in Section 7(g)(i).

                  "Indemnifying Party" is defined in Section 7(g)(iii).

                  "Independent Directors" is defined in Section 2(a).

                  "Irrevocable  Proxy and Stock Rights Agreement" means the 
Irrevocable  Proxy and Stock Rights  Agreement,  made as of September 1, 19
Group, Inc.

                  "Joinder Agreement" is defined in Section 3(b)(i).

                  "Losses" is defined in Section 7(g)(i).

                  "Management Directors" is defined in Section 2(a).

                  "Management Offer Notice" is defined in Section 6(b).

                  "Management Reply" is defined in Section 6(b).





                  "Management  Shares"  means  Stockholder  Shares  held  by the
Management Stockholders and their permitted transferees. Management Shares shall
cease to be such when they cease to be Stockholder Shares.

                  "Management Stockholders" is defined in the preface.

                  "Market  Value"  means,  with  respect to any  security on any
date,  (x) if such  security  is  quoted  on  NASDAQ  or  listed  on a  national
securities  exchange,  the average daily closing sales price of such security on
NASDAQ or a national securities exchange, as applicable, for the 20 trading days
prior to such date,  and (y) if such  security is not quoted on NASDAQ or listed
on a national securities  exchange,  the fair value per share determined jointly
by the Company and Thayer, provided that if the Company and Thayer are unable to
reach an agreement within a reasonable  period of time, such fair value shall be
determined  by a recognized  investment  banking  firm  jointly  selected by the
Company  and Thayer,  whose  determination  shall be final and binding  upon the
Company and Thayer  (and the fees and  expenses  of such  recognized  investment
banking firm shall be paid by the Company).

                  "NASDAQ" means National Association of Securities Dealers 
Automated Quotations National Market System.

                  "New Securities" is defined in Section 5(a).

                  "Norton" is defined in the preface.

                  "Norton Family Stockholder" means each of J.A.P. Investment
Group, Inc., Kevin M. Norton and Patrick J. Norton, Jr.

                  "Offered Securities" is defined in Section 3(c)(i).

                  "Options" means any options to purchase Common Stock granted
 by the Company.

                  "Other Holder" is defined in Section 3(c)(i).

                  "Other Redeemers" is defined in Section 9.

                  "Other Stockholders" is defined in Section 6(a).

                  "Ownership Percentage" means, with respect to any Stockholder,
a percentage  equal to the product of (a) a fraction,  the numerator of which is
the sum of (i) the number of Common Shares owned by such  Stockholder,  and (ii)
the number of Common  Shares  issuable  upon the exercise of any Stock  Purchase
Warrant or Option owned by such Stockholder, and the denominator of which is the
sum of (x) the number of shares of the Company's  outstanding Common Shares, and
(y) the number of Common Shares issuable upon the exercise of all Stock Purchase
Warrants or Options owned by any of the Stockholders, multiplied by (b) 100.

                  "Permitted Transfers" is defined in Section 3(b).






                  "Person" means any individual, corporation, partnership, firm,
joint venture,  association,  limited liability  company,  joint-stock  company,
trust,  unincorporated  organization,  governmental  or regulatory body or other
legal entity.

                  "Proceeding" is defined in Section 7(g)(iii).

                  "Public  Offering"  means a sale of Common Stock to the public
in an offering  pursuant to an effective  registration  statement filed with the
SEC pursuant to the  Securities  Act, as then in effect,  provided that a Public
Offering  shall not  include  an  offering  made in  connection  with a business
acquisition or combination or an employee benefit plan.

                  "Public  Sale"  means a sale of  Common  Stock  pursuant  to a
Public Offering or a Rule 144 Sale.

                  "Qualified  Sale of the  Company"  means a Sale of the Company
pursuant  to which the  effective  price per  Common  Share for the  holders  of
Stockholder  Shares would be as follows:  (i) if the Sale of the Company  occurs
before  the first  anniversary  of the date  hereof,  (x) 75%  greater  than the
average  daily  closing  sales  price of the  Common  Shares on NASDAQ for the 3
months prior to the date of the public  announcement of the proposed Sale of the
Company and (y) greater than $20.00 (as such amount is proportionately  adjusted
for stock splits,  stock  combinations,  stock  dividends and  recapitalizations
affecting  the Common  Shares  after the date  hereof);  (ii) if the Sale of the
Company  occurs on or after the first  anniversary of the date hereof and before
the second  anniversary  of the date  hereof,  (x) 60% greater  than the average
daily  closing sales price of the Common Shares on NASDAQ for the 3 months prior
to the date of the public  announcement  of the proposed Sale of the Company and
(y) greater  than $18.00 (as such amount is  proportionately  adjusted for stock
splits, stock combinations,  stock dividends and recapitalizations affecting the
Common Shares after the date hereof); (iii) if the Sale of the Company occurs on
or after  the  second  anniversary  of the date  hereof  and  before  the  third
anniversary  of the date hereof,  (x) 45% greater than the average daily closing
sales price of the Common Shares on NASDAQ for the 3 months prior to the date of
the public announcement of the proposed Sale of the Company and (y) greater than
$16.00 (as such  amount is  proportionately  adjusted  for stock  splits,  stock
combinations,  stock dividends and recapitalizations affecting the Common Shares
after the date hereof);  and (iv) if the Sale of the Company  occurs on or after
the third anniversary of the date hereof, (x) 30% greater than the average daily
closing sales price of the Common Shares on NASDAQ for the 3 months prior to the
date of the public  announcement  of the  proposed  Sale of the  Company and (y)
greater  than  $14.00  (as such  amount is  proportionately  adjusted  for stock
splits, stock combinations,  stock dividends and recapitalizations affecting the
Common Shares after the date hereof), provided that if the Common Shares are not
then traded on NASDAQ, then the average price per Common Shares for the 3 months
prior to the date of the public announcement of the proposed Sale of the Company
as determined in good faith by the Board.

                  "Redeemable Shares" is defined in Section 9.

                  "Redemption Notice" is defined in Section 9.






                  "Refused Securities" is defined in Section 5(d).

                  "Registrable Securities" means any Common Shares, except
Common Shares which have been Transferred in a Public Sale.

                  "Registration Notice" is defined in Section 7(b)(i).

                  "Registration Request" is defined in Section 7(b)(i).

                  "Registration  Statement" means any registration  statement of
the Company under which any of the Registrable  Securities are included  therein
pursuant  to  the  provisions  of  this  Agreement,  including  the  prospectus,
amendments  and   supplements   to  such   registration   statement,   including
post-effective  amendments,  all  exhibits,  and all  material  incorporated  by
reference  or  deemed  to be  incorporated  by  reference  in such  registration
statement. The Shelf shall be deemed a Registration Statement.

                  "Requesting Holders" is defined in Section 7(b)(i).

                  "Rule 144 Sale"  means a sale of  Common  Stock to the  public
through a broker,  dealer or market-maker pursuant to the provisions of Rule 144
adopted under the Securities Act (or any successor rule or regulation).

                  "S-3 Demand Registration" is defined in Section 7(k)(i).

                  "S-3 Registration Notice" is defined in Section 7(k)(i).

                  "S-3 Registration Request" is defined in Section 7(k)(i).

                  "S-3 Requesting Holders" is defined in Section 7(k)(i).

                  "Sale Notice" is defined in Section 3(c)(i).

                  "Sale of the Company" means,  whether in a single  transaction
or in a series of related  transactions,  (i) a sale of all or substantially all
of the assets of the Company and its  Subsidiaries  on a consolidated  basis, or
(ii) the  Transfer  or other  disposition  of more  than 50% of the  outstanding
Common Stock or the outstanding common equity securities of any of the Company's
Subsidiaries  (in  each  case  whether  accomplished  by stock  purchase,  asset
purchase, merger, recapitalization, reorganization or other transaction).

                  "SEC" means the United States Securities and Exchange 
Commission.

                  "Securities Act" means the Securities Act of 1933, as amended.

                  "Selling Holder" is defined in Section 3(c)(i).

                  "Shelf" is defined in Section 7(a).





                  "Stockholders" is defined in the preface.

                  "Stock Notice of Acceptance" is defined in Section 5(c).

                  "Stock Offer" is defined in Section 5(c).

                  "Stock Offer Period" is defined in Section 5(c).

                  "Stock Option Plans" means the 1998 Long-Term  Incentive Plan,
the Employee Share  Purchase Plan and any other plan of the Company  pursuant to
which the Company issues options, stock appreciation rights, restricted stock or
other stock based compensation to officers, employees,  directors or consultants
of the Company or any of its Subsidiaries.

                  "Stock  Purchase  Warrant"  means,  collectively,   the  Stock
Purchase  Warrant,  dated  as of the date  hereof,  by the  Company  in favor of
Thayer,  and any subsequent stock purchase warrant or stock purchase warrants in
favor of Thayer or any of its  Affiliates  issued  pursuant to or in  connection
with the Stock Purchase Warrant,  dated as of the date hereof, by the Company in
favor of Thayer.

                  "Stockholder  Shares" means (i) all shares of Common Stock now
owned or in the future  acquired by the  Stockholders,  including  all shares of
Common Stock acquired  pursuant to the exercise of Options or the Stock Purchase
Warrant,  and (ii) all  shares of  Common  Stock or other  securities  issued or
issuable  directly or indirectly  with respect to the securities  referred to in
clause  (i) by way of stock  dividend  or stock  split or in  connection  with a
combination  of  shares,   recapitalization,   merger,  consolidation  or  other
reorganization.  Stockholder  Shares  shall  cease to be such as provided in the
last sentence of Section 3(b).

                  "Subsidiary"  means,  with  respect to any  Person,  any other
Person of which at least a majority of the  outstanding  shares or other  equity
interests  having  ordinary  voting  power  for the  election  of  directors  or
comparable  managers of such Person are owned,  directly or  indirectly,  by the
first Person or one or more Subsidiaries of such first Person.

                  "Tag-Along Notice"  is defined in Section 3(c)(i).

                  "Thayer" is defined in the preface.

                  "Thayer Directors" is defined in Section 2(a) and 2(b).

                  "Thayer Notice of Acceptance" is defined in Section 5(b).

                  "Thayer Offer" is defined in Section 5(b).

                  "Thayer Offer Period" is defined in Section 5(b).

                  "Thayer  Shares" means  Stockholder  Shares held by the Thayer
and its  permitted  transferees.  Thayer Shares shall cease to be such when they
cease to be Stockholder Shares.






                  "Transfer" means, with respect to any Stockholder  Shares, the
gift, sale,  assignment,  transfer,  pledge,  hypothecation or other disposition
(whether for or without  consideration and whether voluntary,  involuntary or by
operation of law) of such Stockholder Shares or any interest therein.

                  "Warrant  Shares" means the Common Shares issued in connection
with the exercise of the Stock Purchase  Warrant,  so long as such Common Shares
continue to be Stockholder Shares.

         Section 2.        Voting Arrangements.

                  (a) Election of Directors.  Except as set for in Section 2(b),
each  Stockholder  agrees that such Person will vote, or cause to be voted,  all
voting securities of the Company over which such Person has the power to vote or
direct the voting,  and will take all other necessary or desirable action within
such  Person's  control,  and the Company will take all  necessary and desirable
actions within its control,  to cause the authorized number of directors for the
Company to be established at six directors,  and to elect or cause to be elected
to the Board and cause to be  continued  in such  offices  as  follows:  (i) two
individuals designated by Thayer (the "Thayer Directors"),  (ii) two individuals
designated by the Management Stockholders (the "Management Directors") and (iii)
two  individuals  who are not  employees of the Company or its  Subsidiaries  or
Affiliates,  designated by a nominating  committee  comprised of one  individual
designated  by the  Management  Stockholders  and one  individual  designated by
Thayer (the "Independent Directors");  provided that for so long as the Board is
divided into three classes,  the "Class I" directors shall consist of one Thayer
Director and one Independent Director, the "Class II" directors shall consist of
one Thayer Director and one  Independent  Director and the "Class III" directors
shall consist of two Management Directors.






                  (b) Additional Directors.  Notwithstanding  anything herein to
the contrary,  in the event that (x) the Board does not approve an Approved Sale
and the Thayer  Directors  voted in favor of such Approved Sale or (y) the Board
does not vote on whether to approve an Approved Sale within a reasonable  period
of time  after  Thayer  requests  the Board to approve an  Approved  Sale,  each
Stockholder  agrees that such Person will vote, or cause to be voted, all voting
securities of the Company over which such Person has the power to vote or direct
the voting,  and will take all other  necessary or desirable  action within such
Person's control,  and the Company will take all necessary and desirable actions
within its control,  to cause the authorized number of directors for the Company
and  each  of its  Subsidiaries  to be  increased  from  six  directors  to nine
directors,  and to elect or cause to be elected  to the  Board,  and cause to be
continued in such office (for so long as  reasonably  necessary for the Board to
approve and the Company to consummate such Approved Sale),  the three additional
directors of the Board  designated  by Thayer  (also,  the "Thayer  Directors");
provided,  however,  that  if the  Board  is then  divided  into  classes,  each
Stockholder  agrees that such Person will vote, or cause to be voted, all voting
securities of the Company over which such Person has the power to vote or direct
the voting,  and will take all other  necessary or desirable  action within such
Person's control,  and the Company will take all necessary and desirable actions
within its  control,  including  if necessary  abolishing  the three  classes of
directors and establishing only one class of directors, to cause the majority of
the directors on the then current Board to consist of Thayer Directors.

                  (c) Removal of  Directors.  If at any time Thayer shall notify
the other  Stockholders  of its desire to remove,  with or  without  cause,  any
individual  designated by Thayer  pursuant to Section 2(a),  2(b) or 2(k) from a
directorship,  or if at any time the  Management  Stockholders  shall notify the
other  Stockholders  of their  desire to  remove,  with or  without  cause,  any
individual  designated by the Management  Stockholders  pursuant to Section 2(a)
above from a  directorship,  all such Persons so notified will vote, or cause to
be voted, all voting securities of the Company or any Subsidiary of the Company,
as applicable,  over which they have the power to vote or direct the voting, and
will take all other necessary or desirable action within such Person's  control,
and the  Company  will take all  necessary  and  desirable  actions  within  its
control, to cause the removal of such director.

                  (d) Vacancies.  If at any time any director ceases to serve on
the board of directors of the Company or any Subsidiary of the Company  (whether
due to  resignation,  removal  or  otherwise),  then  Thayer  or the  Management
Stockholders, as applicable, shall be entitled to designate a successor director
to fill the vacancy  created  thereby on the terms and subject to the conditions
of Section 2(a), 2(b) or 2(k), as applicable.  Each Stockholder  agrees that he,
she or it will vote, or cause to be voted, all voting  securities of the Company
or any Subsidiary of the Company over which such Person has the power to vote or
direct the voting,  and shall take all such other  actions  promptly as shall be
necessary  or  desirable  to cause  the  successor  designated  by Thayer or the
Management Stockholders, as applicable, to be elected to fill such vacancy.

                  (e)  Rights  Unimpaired.  Nothing in this  Agreement  shall be
construed  to impair  any rights  that the  stockholders  of the  Company or any
Subsidiary of the Company may have to remove any director for cause.  No removal
for cause of an  individual  designated  pursuant to this Section 2 shall affect
the right of Thayer or the Management Stockholders,  as applicable, to designate
a different  individual pursuant to this Section 2 to fill the directorship from
which such individual was removed.






                  (f)  APPOINTMENT OF PROXY.  IN ORDER TO SECURE THE OBLIGATIONS
OF EACH AND EVERY MANAGEMENT  STOCKHOLDER TO VOTE ALL COMMON SHARES HELD BY SUCH
MANAGEMENT  STOCKHOLDER IN ACCORDANCE WITH ALL OF THE PROVISIONS OF SECTION 2(b)
OF THIS AGREEMENT,  EACH MANAGEMENT  STOCKHOLDER HEREBY IRREVOCABLY  CONSTITUTES
AND APPOINTS CARL J. RICKERTSEN AS SUCH MANAGEMENT STOCKHOLDER'S TRUE AND LAWFUL
ATTORNEY,  AGENT AND PROXY, WITH FULL POWER OF SUBSTITUTION,  TO ATTEND MEETINGS
OF  STOCKHOLDERS  OF THE  COMPANY  HELD FROM  TIME TO TIME,  AND TO VOTE ON SUCH
MANAGEMENT  STOCKHOLDER'S  BEHALF AND IN SUCH  STOCKHOLDER'S  NAME,  PLACE,  AND
STEAD,  OR TO EXECUTE WRITTEN  CONSENTS IN LIEU OF SUCH MEETINGS,  THE NUMBER OF
VOTES THAT SUCH  MANAGEMENT  STOCKHOLDER  WOULD BE  ENTITLED TO CAST IF ACTUALLY
PRESENT OR WITH RESPECT TO WHICH SUCH MANAGEMENT  STOCKHOLDER  WOULD BE ENTITLED
TO EXECUTE A WRITTEN  CONSENT,  IN CONNECTION WITH ANY ELECTION OF DIRECTORS (IN
ACCORDANCE  WITH SECTION 2(b)) OR ANY APPROVED SALE (IN ACCORDANCE  WITH SECTION
6). THE POWERS  GRANTED  HEREIN WILL BE DEEMED TO BE COUPLED  WITH AN  INTEREST,
WILL BE  IRREVOCABLE  AND WILL SURVIVE THE DEATH,  INCOMPETENCY,  DISABILITY  OR
DISSOLUTION OF ANY MANAGEMENT STOCKHOLDER.

                  (g) Committees.  The Compensation Committee of the Board shall
at all times grant all awards under the Stock  Option  Plans.  The  Compensation
Committee  shall  consist of four  members,  two of which  shall be  Independent
Directors and two of which shall be Thayer  Directors.  All other  committees of
the Board shall at all times consist of at least one Thayer Director.

                  (h) Stock Purchase Warrant.  Each Stockholder agrees that such
Person will vote,  or cause to be voted,  all voting  securities  of the Company
over which such Person has the power to vote or direct the voting, and will take
all other necessary or desirable  action within such Person's  control,  and the
Company will take all  necessary and desirable  actions  within its control,  so
that Thayer (or any Person  designated  by Thayer) may exercise its rights under
the Stock Purchase Warrant pursuant to the terms thereof.

                  (i) Initial Thayer Directors. Thayer hereby designates Carl J.
Rickertsen  as the initial  "Class II" Thayer  Director and Dr. Paul G. Stern as
the initial "Class I" Thayer Director.

                  (j)  Fiduciary  Duties  Unchanged.  Nothing in this  Agreement
shall be construed to limit, change or eliminate any fiduciary duties a director
of the Company or any Subsidiary of the Company may have to the  stockholders of
the Company or any Subsidiary of the Company under Delaware law.

                  (k) Election of Subsidiaries' Directors. The Company will take
all necessary and desirable  actions  within its control to elect or cause to be
elected to the respective boards of directors of each of the Company's  domestic
Subsidiaries,  and cause to be  continued in such  offices,  at least one Thayer
Director.  Thayer hereby  designates  Carl J.  Rickertsen as the initial  Thayer
Director for the purposes of this Section 2(k).

                  Section 3.........Restrictions on Transfer.

                  (a)      Restrictions on Transfer.  No holder of Stockholder 
Shares may Transfer such Stockholder Shares except in a Permitted Transfer.






                  (b)      Certain  Permitted  Transfers.  Section 3(a)  shall 
not  apply  to  Transfers  ("Permitted  Transfers")  of Stockholder Shares:

                           (i)  to  any   Affiliate   of  the   holder  of  such
         Stockholder  Shares,  provided  that (x) such  Transfers do not violate
         federal or state securities  laws, and (y) the transferees  (other than
         partners  of  Thayer  Equity  Investors  III,  L.P.)  execute a Joinder
         Agreement  substantially  in the form  attached  hereto as Exhibit A (a
         "Joinder Agreement") and thereby become a party to this Agreement;

                           (ii) from a Norton  Family  Stockholder  to Norton 
 pursuant to the  Irrevocable  Proxy and Stock Rights Agreement;

                           (iii) to the Company,  subject to the  provisions  of
         Section 9, provided that in no event shall such Transfers occur without
         the prior  written  consent of Thayer if such  Transfers  (after taking
         into account all  Transfers in  connection  with related  Co-Redemption
         Notices as provided in Section 9) would result in the Management Shares
         and  Thayer  Shares,  collectively,  constituting  less than 51% of the
         outstanding Common Shares of the Company;

                           (iv) to Thayer or any Affiliate  thereof  pursuant to
         Section  10(a),  provided that in no event shall such  Transfers  occur
         without the prior written consent of the holders of at least a majority
         of the then  outstanding  Management  Shares  if such  Transfers  would
         result in the Thayer  Shares and Common  Shares  issuable in connection
         with  the  exercise  of a  Stock  Purchase  Warrant  in  the  aggregate
         constituting  more than 33.3% of the Common  Shares of the Company on a
         fully diluted basis, provided further that if such Transfers are to any
         Affiliate of Thayer, (x) such Transfers do not violate federal or state
         securities laws, and (y) such Affiliate executes a Joinder Agreement;

                           (v) to Thayer or any  Affiliate  thereof  pursuant to
         Section  10(b),  provided that if such Transfers are to an Affiliate of
         Thayer,  (x) such Transfers do not violate federal or state  securities
         laws, and (y) such Affiliate executes a Joinder Agreement;

                           (vi) pursuant to Section 6(b), provided that (x) such
         Transfers do not violate federal or state  securities laws, and (y) the
         transferees  execute a Joinder  Agreement and thereby become a party to
         this Agreement  (unless the applicable Block of Shares  constituted 85%
         or more of the Common  Shares  then owned by Thayer and its  Affiliates
         (provided  that the limited  partners of Thayer Equity  Investors  III,
         L.P.  shall not be treated as  Affiliates of Thayer for the purposes of
         this Section 3(b)(vi)) and Thayer elected in the applicable  Management
         Offer Notice for the transferees not to execute a Joinder Agreement);

                           (vii) in a Public Sale,  subject to the provisions of
         Section  3(d),  provided  that in no event shall such  Transfers  occur
         without the prior  written  consent of Thayer if such  Transfers  would
         result  in the  Management  Shares  and  Thayer  Shares,  collectively,
         constituting  less  than 51% of the  outstanding  Common  Shares of the
         Company;






                           (viii) in a Public Sale, subject to the provisions of
         Section  3(d),  provided  that in no event shall such  Transfers  occur
         without the prior written  consent of Thayer if (w) such  transferor is
         Bruce M. Bowen or any of his Affiliates,  and such Transfers  (combined
         with all other Transfers  pursuant to this Section  3(b)(viii)(w))  are
         for more than 20,000  Common  Shares in any 3 month  period or for more
         than 80,000 Common Shares, (x) such transferor is JAP Investment Group,
         Inc. or any of its  Affiliates,  and such Transfers  (combined with all
         other Transfers  pursuant to this Section  3(b)(viii)(x))  are for more
         than  25,000  Common  Shares  in any 3 month  period  or for more  than
         100,000 Common Shares, (y) such transferor is Kevin M. Norton or any of
         his Affiliates,  and such Transfers  (combined with all other Transfers
         pursuant to this Section 3(b)(viii)(y)) are for more than 12,500 Common
         Shares in any 3 month period or for more than 50,000  Common  Shares or
         (z) such transferor is Patrick J. Norton, Jr. or any of his Affiliates,
         and such Transfers  (combined with all other Transfers pursuant to this
         Section  3(b)(viii)(z)) are for more than 12,500 Common Shares in any 3
         month period or for more than 50,000 Common Shares;

                           (ix)  pursuant  to an Approved  Sale,  subject to the
         provisions of Sections 3(c) and 6(b);

                           (x)   incidental  to  the  exercise,   conversion  or
         exchange  thereof in accordance  with their terms,  any  combination of
         shares  (including  any reverse  stock split) or any  recapitalization,
         reorganization or  reclassification  of, or any merger or consolidation
         involving, the Company;

                           (xi) from a  Management  Stockholder  to Thayer,  any
         Affiliate thereof or any Person designated by Thayer,  provided that in
         no event shall such Transfers  occur without the prior written  consent
         of  the  holders  of at  least  a  majority  of  the  then  outstanding
         Management  Shares if such Transfers  would result in the Thayer Shares
         and Common Shares  issuable in connection  with the exercise of a Stock
         Purchase Warrant in the aggregate  constituting  more than 33.3% of the
         Common  Shares of the Company on a fully  diluted  basis (except to the
         extent  permitted  under Section 3(d)),  provided  further that if such
         Transfers  are to an  Affiliate of Thayer or any Person  designated  by
         Thayer,  (x) such Transfers do not violate federal or state  securities
         laws,  and (y) such  Affiliate or any Person  designated by Thayer,  as
         applicable, executes a Joinder Agreement;

                           (xii)  pursuant to Section  3(c),  provided  that (x)
         such Transfers do not violate federal or state securities laws, and (y)
         if the  transferees in the Transfers to which the tag-along right under
         Section 3(c) is related  execute a Joinder  Agreement,  the transferees
         pursuant to the Transfer pursuant to this clause (xi) execute a Joinder
         Agreement and thereby become a party to this Agreement; and






                           (xiii)  to  any  Person  other  than  pursuant  to  a
         Transfer  described  above,  subject to the provisions of Sections 3(c)
         and 6(b),  provided that (x) such  Transfers do not violate  federal or
         state  securities  laws,  and (y) the  transferees  execute  a  Joinder
         Agreement  and thereby  become a party to this  Agreement  (unless such
         Transfers are by Thayer or any Affiliate  thereof of 85% or more of the
         Common Shares then owned by Thayer and its  Affiliates  (provided  that
         the limited  partners of Thayer Equity Investors III, L.P. shall not be
         treated  as  Affiliates  of Thayer  for the  purposes  of this  Section
         3(b)(xiii))  Thayer Shares,  in which case such transferees  shall only
         execute a Joinder Agreement if Thayer so elects).

Any  Stockholder  Shares  transferred  pursuant to clause (i), (ii),  (iv), (v),
(vi),  (x),  (xi) or (xiii) above shall  continue to be  Stockholder  Shares for
purposes of this  Agreement,  any  Stockholder  Shares  transferred  pursuant to
clause (iii),  (vii), (viii) or (ix) above shall no longer be Stockholder Shares
and hence no longer subject to any of the restrictions set forth herein, and any
Stockholder Shares transferred pursuant to clause (xii) above (x) shall continue
to be Stockholder  Shares if the Stockholder  Shares transferred in the Transfer
to which the  tag-along  right  under  Section  3(c) is related  continue  to be
Stockholder  Shares,  and (y)  shall no  longer  be  Stockholder  Shares  if the
Stockholder  Shares  transferred  in the Transfer to which the  tag-along  right
under Section 3(c) is related cease to be Stockholder Shares.

                  (c)      Tag-Along Rights.






     (i)...  Prior to making any  Transfer  of  Stockholder  Shares  pursuant to
Section  3(b)(ix) or 3(b)(xiii),  any holder of Stockholder  Shares proposing to
make such a Transfer  (for  purposes of this Section  3(c), a "Selling  Holder")
shall give at least thirty (30) days prior  written  notice to each other holder
of  Stockholder  Shares  (for  purposes  of this  Section  3(c) each,  an "Other
Holder") and the Company,  which notice (for purposes of this Section 3(c),  the
"Sale Notice")  shall  identify the type and amount of Stockholder  Shares to be
sold (for purposes of this Section 3(c), the "Offered Securities"), describe the
terms and conditions of such proposed  Transfer,  and identify each  prospective
transferee.  Any of the Other  Holders may,  within  fifteen (15) days after the
receipt of the Sale Notice,  give written notice (each, a "Tag-Along Notice") to
the Selling Holder that such Other Holder wishes to participate in such proposed
Transfer  upon the terms and  conditions  set  forth in the Sale  Notice,  which
Tag-Along  Notice shall specify the Common  Shares such Other Holder  desires to
include in such proposed Transfer; provided, however, that (1) each Other Holder
shall be required,  to the extent applicable,  as a condition to being permitted
to sell Common Shares  pursuant to Section  3(b)(xiii)  and this Section 3(c) in
connection with a Transfer of Offered Securities, to elect to sell Common Shares
of the same type and class and in the same  relative  proportions  as the Common
Shares which comprise the Offered Securities;  and (2) to exercise such Person's
tag-along  rights  hereunder,  each  Other  Holder  must  agree  to  make to the
transferee the same  representations,  warranties,  covenants,  indemnities  and
agreements as the Selling Holder agrees to make in connection  with the Transfer
of the  Offered  Securities  (except  that in the  case of  representations  and
warranties  pertaining  specifically to, or covenants made  specifically by, the
Selling  Holder,  the Other Holders shall make  comparable  representations  and
warranties  pertaining  specifically to (and, as applicable,  covenants by) such
Persons),  and must agree to bear such  Person's  pro rata  share  (which may be
joint and  several  but shall be based on the  value of Common  Shares  that are
Transferred)   of  all   liabilities   to  the   transferees   arising   out  of
representations,  warranties  and covenants  (other than those  representations,
warranties and covenants that pertain  specifically to a given Person, who shall
bear all of the liability related thereto), indemnities or other agreements made
in connection with the Transfer.  Each  Stockholder  will bear (x) such Person's
own costs of any sale of Common Shares  pursuant to Section  3(b)(xiii) and this
Section  3(c) and (y) such  Person's  pro rata share  (based  upon the  relative
amount  of Common  Shares  sold) of the  reasonable  costs of any sale of Common
Shares  pursuant to Section  3(b)(xiii) and this Section 3(c) to the extent such
costs are  incurred  for the  benefit of all  selling  Stockholders  and are not
otherwise paid by the acquiring party.

     (ii).....If  none of the Other  Holders  gives the Selling  Holder a timely
Tag-Along Notice with respect to the Transfer proposed in the Sale Notice,  then
the  Selling  Holder  may  Transfer  such  Offered  Securities  on the terms and
conditions  set  forth in the Sale  Notice  to or among  any of the  transferees
identified (or  Affiliates of transferees  identified) in the Sale Notice at any
time within ninety days after  expiration of the  fifteen-day  period for giving
Tag-Along Notices with respect to such Transfer. Any such Offered Securities not
Transferred  by the Selling Holder during such  ninety-day  period will again be
subject to the  provisions of this Section 3(c) upon a subsequent  Transfer.  If
one or more Other  Holders give the Selling  Holder a timely  Tag-Along  Notice,
then the Selling Holder shall use all reasonable efforts to obtain the agreement
of the prospective  transferee(s)  to the  participation of the Other Holders in
any contemplated Transfer, on the same terms and conditions as are applicable to
the  Offered  Securities,  and no  Selling  Holder  shall  Transfer  any of such
Person's shares to any prospective transferee if such prospective  transferee(s)
declines to allow the  participation  of the Other Holders.  If the  prospective
transferee(s)  is unwilling  or unable to acquire all of the Offered  Securities
and all of the Common Shares to be Transferred by the Other Holders specified in
a timely  Tag-Along  Notice upon such terms,  then the Selling  Holder may elect
either to cancel such  proposed  Transfer or to allocate  the maximum  number of
each class of Common  Shares  that the  prospective  transferees  are willing to
purchase (the "Allocable Shares") among the Selling Holder and the Other Holders
giving  timely  Tag-Along  Notices  as  follows  (it being  understood  that the
prospective  transferees shall be required to purchase Common Shares of the same
class on the same terms and  conditions  taking into account the  provisions  of
clause (1) of Section  3(c)(i),  and to consummate  such Transfer on those terms
and conditions):

                                    (x)    each    participating     Stockholder
                  (including  the  Selling  Holder)  shall be entitled to sell a
                  number  of shares of Common  Shares  (not to  exceed,  for any
                  Other  Holder,  the  number of shares  of such  Common  Shares
                  identified in such Other Holder's  Tag-Along  Notice) equal to
                  the  product  of (A) the  number of  Allocable  Shares of such
                  class of Common  Shares and (B) a fraction,  the  numerator of
                  which is such Stockholder's Ownership Percentage of such class
                  of Common Shares and the denominator of which is the aggregate
                  Ownership  Percentage for all  participating  Stockholders  of
                  such class of Common Shares; and

                                    (y) if after allocating the Allocable Shares
                  of  any  class  of  Common  Shares  to  such  Stockholders  in
                  accordance  with  clause  (x) above,  there are any  Allocable
                  Shares of such class that remain unallocated,  then they shall
                  be allocated  (in one or more  successive  allocations  on the
                  basis of the allocation  method specified in clause (x) above)
                  among the Selling  Holder and each such Other  Holder that has
                  elected in its  Tag-Along  Notice to sell a greater  number of
                  shares of such class of Common Shares than previously has been
                  allocated  to such  Person  pursuant  to  clause  (x) and this
                  clause (y) (all of whom (but no others) shall, for purposes of
                  clause   (x)  above,   be  deemed  to  be  the   participating
                  Stockholders)  until  all  such  Allocable  Shares  have  been
                  allocated in accordance with this clause (y).






                  (d) Public Thayer Offer.  Notwithstanding  anything  herein to
the  contrary,  prior to any  holder  of  Management  Shares  transferring  such
Management Shares pursuant to Section 3(b)(vii) or 3(b)(viii), such holder shall
give at least three business days prior written  notice to Thayer,  which notice
shall identify the type,  amount and price per share of the Management Shares to
be sold. Thayer may, within such three business day period,  give written notice
to such holder  that Thayer  and/or any Person  designated  by Thayer  wishes to
purchase all or a portion of such Management Shares at such price. If Thayer (or
any Person  designated  by Thayer)  elects to purchase  all or a portion of such
Management  Shares by giving a timely  notice to such holder,  such  Transfer to
Thayer or any Person  designated  by Thayer,  applicable,  shall occur within 15
business days after the date the applicable  notice was sent to Thayer  pursuant
to the terms and conditions set forth in Section 3(b)(xi),  provided that if the
holder of Management Shares sent the notice pursuant to Section 3(b)(viii),  the
33.3%  limitation  regarding  Thayer Shares and Common Shares  issuable upon the
exercise of a Stock Purchase  Warrant shall be waived.  If Thayer does not elect
to purchase  all of such  Management  Shares (or a Transfer  of such  Management
Shares  pursuant to Section  3(b)(xi)  does not occur within the  applicable  15
business  day period  despite  the  reasonable  best  efforts of such  holder of
Management  Shares),  then such holder of  Management  Shares may Transfer  such
remaining  Management  Shares at a price per share no less than 95% of the price
per share set forth in the  applicable  notice at any time  within  ninety  days
after such  holder  sent the notice of such  proposed  Transfer  to Thayer.  Any
Management  Shares not transferred by such holder during such ninety-day  period
shall again be subject to the  provisions of this Section 3(d) upon a subsequent
Transfer pursuant to Section 3(b)(vii) or 3(b)(viii).

                  (e) Transfers in Violation of this Agreement.  Any Transfer or
attempted  Transfer of any  Stockholder  Shares in violation  of this  Agreement
shall be void, and the Company shall not be obligated to record such Transfer on
its books or treat any  purported  transferee of such Common Shares as the owner
of such Common Shares for any purpose.

                  Section 4.........Legends.

                  (a)      Stockholders  Agreement Legend.  The certificates 
representing  Stockholder Shares shall bear the following legend:

         THE  SECURITIES  REPRESENTED  BY  THIS  CERTIFICATE  ARE  SUBJECT  TO A
         STOCKHOLDERS AGREEMENT DATED AS OF OCTOBER 23, 1998 AMONG MLC HOLDINGS,
         INC. AND CERTAIN OF ITS  STOCKHOLDERS,  A COPY OF WHICH MAY BE OBTAINED
         WITHOUT CHARGE BY THE HOLDER HEREOF AT THE PRINCIPAL  PLACE OF BUSINESS
         OF MLC HOLDINGS, INC. DISPOSITION OF THIS CERTIFICATE OR THE SECURITIES
         REPRESENTED  HEREBY OR ANY RIGHTS OR INTERESTS  THEREIN IN VIOLATION OF
         SUCH STOCKHOLDERS AGREEMENT SHALL BE NULL AND VOID.

Each holder of Stockholder  Shares shall provide the Company  promptly after the
date hereof (and in no event later than 14 days after the date  hereof) with his
or her certificates  representing  Stockholder Shares so that such legend can be
placed thereon.






                  (b) Removal of Legends.  Whenever the  restrictions  described
above cease to be applicable to any Stockholder Shares, the holder thereof shall
be entitled to receive from the Company,  without  expense to the holder,  a new
certificate not bearing a legend stating such restriction.

                  Section   5.........Preemptive   Rights.   The   Company   may
authorize, issue, sell or enter into any agreement providing for the issuance or
sale  (contingent  or  otherwise)  of  equity  securities  (including,   without
limitation,  the Common  Stock) only in accordance  with the  provisions of this
Section 5.

                  (a) Restrictions.  On or prior to the six month anniversary of
the date hereof,  except in the case of Excluded  Securities,  without  Thayer's
prior written consent,  the Company shall not issue, sell or exchange,  agree to
issue, sell or exchange, or reserve or set aside for issuance, sale or exchange,
any (i) Common Shares,  (ii) any debt security of the Company which by its terms
is convertible  into or  exchangeable  for any equity security of the Company or
has an equity kicker or other  participation  rights,  (iii) any security of the
Company that is a combination of debt and equity or (iv) any option,  warrant or
other right to subscribe for,  purchase or otherwise acquire any equity security
or any  such  debt  security  of the  Company  (subsections  (i)  through  (iv),
collectively, the "New Securities").

                  (b) Thayer Offer.  After the six month anniversary of the date
hereof, but on or prior to the second anniversary of the date hereof,  except in
the case of  Excluded  Securities  or as set  forth  in  Section  5(g),  without
Thayer's prior written consent,  the Company shall not issue,  sell or exchange,
agree to issue, sell or exchange, or reserve or set aside for issuance,  sale or
exchange,  any New Securities  unless in each case, the Company shall have first
offered to sell all of such New  Securities  to  Thayer,  at a price and on such
other terms as shall have been specified by the Company in writing  delivered to
Thayer at least 15 business days prior to the proposed  consummation of the sale
of the New  Securities  (the  "Thayer  Offer"),  which Thayer Offer by its terms
shall remain open and irrevocable for a period of 10 business days from the date
it is delivered by the Company (the "Thayer Offer  Period").  Notice of Thayer's
intention to accept,  in whole or in part,  the Thayer Offer shall be in writing
signed and delivered to the Company prior to the end of the Thayer Offer Period,
setting  forth such portion of the New  Securities  as Thayer elects to purchase
(the "Thayer Notice of Acceptance").

                  (c) Stock  Offer.  After the  second  anniversary  of the date
hereof,  except in the case of  Excluded  Securities  or as set forth in Section
5(g), without Thayer's prior written consent,  the Company shall not issue, sell
or  exchange,  agree to issue,  sell or  exchange,  or  reserve or set aside for
issuance,  sale or exchange, any New Securities unless in each case, the Company
shall  have first  offered  to sell to Thayer a portion  of such New  Securities
equal to Thayer's  Ownership  Percentage,  at a price and on such other terms as
shall have been specified by the Company in writing delivered to Thayer at least
15  business  days  prior to the  proposed  consummation  of the sale of the New
Securities (the "Stock Offer"), which Stock Offer by its terms shall remain open
and  irrevocable  for a period of 10 business days from the date it is delivered
by the Company  (the "Stock  Offer  Period").  Notice of Thayer's  intention  to
accept,  in whole or in part,  the Stock Offer shall be in writing and delivered
to the Company  prior to the end of the Stock Offer  Period,  setting forth such
portion of the New Securities as Thayer elects to purchase (the "Stock Notice of
Acceptance").






                  (d) Refused  Securities.  The Company  shall have three months
from the  expiration  of the Thayer Offer Period or the Stock Offer  Period,  as
applicable,  to sell  all or any of such New  Securities  which  Thayer  has not
purchased  pursuant  to  Section  5(b) or  5(c),  as  applicable  (the  "Refused
Securities"),  to any other  Person(s),  but only at a price no less than 95% of
the  price  per share set  forth in the  Thayer  Offer or the  Stock  Offer,  as
applicable,  and  upon  such  other  terms  and  conditions,  which  are no more
favorable to such other  Person(s)  or less  favorable to the Company than those
set  forth in the  Thayer  Offer or the Stock  Offer,  as  applicable.  Upon the
closing,  which shall  include full payment to the Company,  of the sale to such
other  Person(s) of all the Refused  Securities,  Thayer shall purchase from the
Company,  and the Company shall sell to Thayer, the New Securities in respect of
which  a  Thayer  Notice  of  Acceptance  or  Stock  Notice  of  Acceptance,  as
applicable, was delivered to the Company by Thayer at the terms specified in the
Thayer Offer or the Stock Offer, as applicable.

                  (e) Exclusions. In each case, any New Securities not purchased
by Thayer or any other Person(s) within three months after the expiration of the
Thayer Offer Period or the Stock Offer Period, as applicable, in accordance with
Section 5 may not be sold or otherwise  disposed of until they are again offered
to Thayer under the procedures specified in this Section 5.

                  (f)Excluded Securities.The rights of Thayer under this Section
5 shall not apply to the following securities (the "Excluded Securities"):

                                    (i)   Common  Shares  issued in  connection
                  with,  or upon  exercise  of,  Options  or the Stock Purchase
                  Warrant; and

                                    (ii) Common Shares issued  incidental to the
                  exercise,  conversion or exchange  thereof in accordance  with
                  their terms, any combination of shares  (including any reverse
                  stock  split)  or  any  recapitalization,   reorganization  or
                  reclassification   of,   or   any   merger,   acquisition   or
                  consolidation involving, the Company.

                  (g) 33.3% Limitation.  Notwithstanding  anything herein to the
contrary,  without  the  prior  written  consent  of the  holders  of at least a
majority of the then outstanding  Management  Shares,  Thayer shall not purchase
from the Company  pursuant to this  Section 5 (and the Company  need not sell or
offer to sell to Thayer pursuant to this Section 5) any shares of New Securities
which would result in the Thayer Shares and Common Shares issuable in connection
with the exercise of a Stock Purchase Warrant in the aggregate constituting more
than  33.3% of the  Common  Shares  of the  Company  on a fully  diluted  basis;
provided,  however if both (x) the proposed  sale,  issuance or exchange of such
New Securities shall occur before the first anniversary of the date hereof,  and
(y) the price per share of the New Securities in such proposed sale, issuance or
exchange  is equal to or less  than  $9.00 (as such  amount  is  proportionately
adjusted  for  stock   splits,   stock   combinations,   stock   dividends   and
recapitalizations affecting the Common Stock after the date hereof), then Thayer
shall  retain all rights  granted in this Section 5 as if this Section 5(g) were
not included in this Agreement.






                  Section 6.........Qualified Sale of the Company.

                  (a) Approved Sale. Subject to Section 6(b), if Thayer approves
a  Qualified  Sale of the Company (an  "Approved  Sale"),  Thayer may notify the
Company and the  Stockholders of Thayer's  election to exercise its rights under
this  Section  6, and the  other  holders  of  Stockholder  Shares  (the  "Other
Stockholders")  shall consent to and raise no  objections  against such Approved
Sale (and shall waive any rights of appraisal  arising in connection  therewith)
and shall fully  cooperate with and take all necessary and desirable  actions in
connection  with the  consummation  of such  Approved  Sale,  including  without
limitation (i) executing a purchase and sale  agreement and any other  agreement
reasonably  necessary to effectuate such Approved Sale in the form to be entered
into  by  Thayer,  (ii)  amending  the  Company's  or any  of its  Subsidiaries'
Certificate  of   Incorporation   or  by-laws,   (iii)  merging,   combining  or
consolidating   the  Company  with  any  other  Person,   (iv)  reorganizing  or
recapitalizing  the Company,  (v) exchanging or splitting  stock of the Company,
(vi) selling, leasing or exchanging all or substantially all of the property and
assets of the Company and its  Subsidiaries on a consolidated  basis or (vii) if
such  Stockholder  is not an "accredited  investor"  (within the meaning of Rule
501(a) of the  Securities  Act),  at the request of Thayer,  appoint a purchaser
representative  (as such term is defined in Rule 501 under the  Securities  Act)
approved by Thayer.  If the Approved Sale is structured as a sale of stock,  the
Other  Stockholders  shall agree to sell all of their shares of Common Stock and
rights to acquire shares of Common Stock on the terms and conditions approved by
Thayer.  The obligations of the Other  Stockholders with respect to any Approved
Sale are  subject  to the  conditions  that (x) the  Approved  Sale is not to an
Affiliate of Thayer,  and (y) upon the  consummation of such Approved Sale, each
Stockholder  shall receive the same form and amount of consideration  per Common
Share, or if any  Stockholders  are given an option as to the form and amount of
consideration to be received,  each Stockholder  shall be given the same option;
provided,  however if Thayer then owns a Stock  Purchase  Warrant,  Thayer shall
elect, in its sole discretion, to either (A) exercise the Stock Purchase Warrant
prior to the consummation of the Approved Sale and participate in such sale as a
holder  of such  class of  Common  Stock,  or (B) upon the  consummation  of the
Approved Sale, receive in exchange for such Stock Warrant Purchase consideration
equal  to  the  amount   determined  by  multiplying  (1)  the  same  amount  of
consideration  per share of a class of Common Stock  received by holders of such
class of Common Stock in  connection  with the  Approved  Sale less the exercise
price per share of such class of Common Stock of the Stock  Purchase  Warrant to
acquire  such class of Common Stock by (2) the number of shares of such class of
Common Stock represented by the Stock Purchase Warrant. Notwithstanding anything
herein to the contrary,  no Approved Sale shall be consummated until the Company
receives,  at the  Company's  expense,  a "fairness  opinion" from an investment
banking firm reasonably acceptable to the Company.






                  (b)  Management  Offer.  Notwithstanding  anything  in Section
3(b)(ix),  3(b)(xiii) or 6(a) to the contrary,  at least 20 days prior to Thayer
transferring  a Block of Shares  pursuant to Section  3(b)(xiii)  or approving a
Qualified  Sale of the  Company,  Thayer  shall  deliver  a  written  notice  (a
"Management Offer Notice") to all Management Stockholders.  The Management Offer
Notice shall disclose in reasonable  detail the proposed  Transfer of a Block of
Shares  pursuant to Section  3(b)(xiii)  or Qualified  Sale of the  Company,  as
applicable,  and  the  prospective  transferee(s)  (if  known).  The  Management
Stockholders,  may elect for any of them and/or any other  Person(s)  (including
the Company)  chosen by the  Management  Stockholders  in their sole  discretion
(collectively,  the  "Buyers")  to  purchase  all (but not less than all) of the
Thayer Shares at the price and on the terms  specified in the  Management  Offer
Notice by delivering  written notice of such election (a "Management  Reply") to
Thayer as soon as practical  but in any event  within 20 days after  delivery of
the  Management  Offer  Notice.  The  Management  Reply  shall be signed by each
Management  Stockholder  (including  those  who  elect  not to  purchase  Thayer
Shares),  and shall include (x) evidence reasonably  satisfactory to Thayer that
the Buyers shall have within 60 days after the delivery of the Management  Offer
Notice sufficient funds to purchase such Thayer Shares, and (y)  representations
and warranties  from each Management  Stockholder  that (X) the Buyers shall use
reasonable  best efforts to consummate  such  purchase  within 60 days after the
delivery of the Management Offer Notice, and (Y) the Buyers shall have within 60
days after the  delivery of the  Management  Offer  Notice  sufficient  funds to
purchase such Thayer Shares.  If the Management  Stockholders  elect to purchase
the Thayer Shares, such purchase shall be consummated as soon as practical after
the delivery of the Management  Reply, but in any event within 60 days after the
delivery of the Management Offer Notice. If either:

                           (A) Thayer does receive a Management  Reply signed by
         each  Management  Stockholder  within  20 days  after  delivery  of the
         Management Offer Notice;

                           (B) Thayer is not reasonably satisfied within 20 days
         after delivery of the Management Offer Notice that the Buyers will have
         within 60 days  after  the  delivery  of the  Management  Offer  Notice
         sufficient funds to purchase such Thayer Shares;

                           (C) the purchase of the Thayer Shares pursuant to the
         Management  Reply is not consummated  within 60 days after the delivery
         of the Management Offer Notice; or

                           (D) after 20 days after  delivery  of the  Management
         Offer Notice but before 60 days after delivery of the Management  Offer
         Notice, Thayer gives written notice to the Management Stockholders that
         Thayer  reasonably  believes  that despite  reasonable  best efforts by
         Thayer to  consummate  the  purchase  the Buyers  will not be unable to
         consummate  the  purchase  within  60 days  after the  delivery  of the
         Management  Offer Notice and the Management  Stockholders are unable to
         provide Thayer  reasonable  assurance to the contrary within 5 business
         days after receiving such notice by Thayer,

then Thayer may,  within 210 days after the  delivery  of the  Management  Offer
Notice,  Transfer such Block of Shares pursuant to Section 3(b)(xiii) or approve
a Qualified Sale of the Company  pursuant to Section 6(a), as  applicable,  at a
price no less than 95% of the price per share specified in the Management  Offer
Notice and on other terms no more  favorable  to the  transferees  thereof  than
offered to the Management  Stockholders in the Management Offer Notice.  If such
Transfer  of  such  Block  of  Shares  or  Qualified  Sale  of the  Company,  as
applicable,  is not  consummated  within  210 days  after  the  delivery  of the
Management Offer,  Thayer shall have to deliver another  Management Offer Notice
under this  Section 6(b) prior to any  subsequent  Transfer of a Block of Shares
pursuant to Section 3(b)(xiii) or Qualified Sale of the Company,  as applicable.
The Management  Stockholders shall be jointly and severally liable to Thayer for
the breach of any representation or warranty set forth in the Management Reply.






                  Section 7.........REGISTRATION RIGHTS.

                  (a) Shelf  Registration.  Thayer  shall  have the right at any
time to demand that the Company include any and all Stockholder  Shares owned by
Thayer or its Affiliates in the Company's shelf registration statement in effect
as of the date hereof (the "Shelf").

                  (b)      DEMAND REGISTRATION.

     (i)......So  long as any Thayer Shares are not included in the Shelf and/or
the  Shelf is not then  effective,  Thayer  shall  have the right  (the  "Demand
Right") to request  registration  under the Securities Act of all or any portion
of the  Registrable  Securities held by Thayer and its Affiliates (in each case,
referred to herein as the  "Requesting  Holders") by delivering a written notice
to the Company, which notice identifies the Requesting Holders and specifies the
number of  Registrable  Securities  to be  included  in such  registration  (the
"Registration  Request").  The Company will give prompt  written  notice of such
Registration  Request (the "Registration  Notice") to all other Stockholders and
will thereupon use its  reasonable  best efforts to effect the  registration  (a
"Demand  Registration")  under the  Securities  Act on any form available to the
Company of:

          (x) the  Registrable  Securities  requested  to be  registered  by the
     Requesting Holders; and

          (y) all other Registrable  Securities which the Company has received a
     written  request from another  Stockholder to register within 30 days after
     the Registration Notice is given.

The Company shall be obligated to effect three Demand Registrations.

     (ii).....A  registration  undertaken  by the  Company a the  request of the
Requesting  Holders will not count as a Demand  Registration if, pursuant to the
applicable  Demand Right,  the  Requesting  Holders fail to register and sell at
least  50% of the  Registrable  Securities  requested  to be  included  in  such
registration by the Requesting Holders.

     (iii)....If  the sole or  managing  underwriter  of a  Demand  Registration
advises  the Company in writing  that in its  opinion the number of  Registrable
Securities and other  securities  requested to be included exceeds the number of
Registrable  Securities and other  securities which can be sold in such offering
without  adversely  affecting the  distribution of the securities being offered,
the price that will be paid in such offering or the marketability  thereof,  the
Company will include in such  registration  the greatest  number of  Registrable
Securities proposed to be registered by the Stockholders which in the opinion of
such  underwriter can be sold in such offering without  adversely  affecting the
distribution  of the securities  being  offered,  the price that will be paid in
such  offering or the  marketability  thereof,  ratably  among the  Stockholders
proposing to register  based on each such  Stockholder's  Ownership  Percentage;
provided,  however,  that the Requesting Holders shall have the right to receive
priority over all other Stockholders in the third Demand Registration.

     (c) INCIDENTAL REGISTRATION.






     (i)  .....At any time the Company  proposes to register  any Common  Shares
under the  Securities  Act (other than pursuant to Section 7(b) or in connection
with a business acquisition or combination or an employee benefit plan), whether
in  connection  with a primary or  secondary  offering,  the  Company  will give
written  notice to each  Stockholder  at least  thirty  (30)  days  prior to the
initial filing of such Registration Statement with the SEC of its intent to file
such Registration  Statement and of such Stockholder's rights under this Section
7(c). Upon the written  request of any Stockholder  made within twenty (20) days
after any such notice is given  (which  request  shall  specify the  Registrable
Securities intended to be disposed of by such Stockholder), the Company will use
its  reasonable  best  efforts  to  effect  the   registration  (an  "Incidental
Registration") under the Securities Act of all Registrable  Securities which the
Company has been so  requested  to register  by the holders  thereof;  provided,
however,  that if, at any time after giving  written  notice of its intention to
register any  securities  and prior to the  effective  date of the  Registration
Statement  filed  in  connection  with  such  Incidental  Registration  (each an
"Incidental Registration Statement"), the Company shall determine for any reason
not to register or to delay registration of such securities, the Company may, at
its election, give written notice of such determination to each Stockholder and,
thereupon, (x) in the case of a determination not to register, the Company shall
be relieved of its obligation to register any Registrable  Securities under this
Section 7(c) in connection with such  registration  (but not from its obligation
to pay the expenses incurred in connection therewith),  and (y) in the case of a
determination  to delay  registration,  the Company  shall be permitted to delay
registering any Registrable Securities under this Section 7(c) during the period
that the registration of such other securities is delayed.

     (ii).....If the sole or managing  underwriter of a registration advises the
Company in writing that in its opinion the number of Registrable  Securities and
other  securities  requested  to be included  exceeds the number of  Registrable
Securities  and  other  securities  which can be sold in such  offering  without
adversely affecting the distribution of the securities being offered,  the price
that will be paid in such  offering or the  marketability  thereof,  the Company
will  include  in  such  registration  the  Registrable   Securities  and  other
securities of the Company in the following order of priority:

          (x) first,  the greatest number of securities of the Company  proposed
     to be  included  in such  registration  by the  Company for its own account
     which in the opinion of such underwriter can be so sold; and

          (y) second, after all securities that the Company proposes to register
     for its own account have been included,  the greatest amount of Registrable
     Securities  requested to be registered by the  Stockholders of which in the
     opinion of such underwriter can be sold in such offering without  adversely
     affecting the distribution of the securities being offered,  the price that
     will be paid in such offering or the marketability  thereof,  ratably among
     the  Stockholders  proposing to register  based on each such  Stockholder's
     Ownership Percentage.

          (d) Holdback Agreements.






     (i) .....Each  Stockholder  agrees that if requested in connection  with an
underwritten   offering  made  pursuant  to  this  Section  7  by  the  managing
underwriter or underwriters of such underwritten offering, such Stockholder will
not  effect any  Public  Sale or  distribution  of any of the  securities  being
registered or any securities convertible or exchangeable or exercisable for such
securities  (except as part of such  underwritten  offering),  during the period
beginning 10 days prior to, and ending 180 days after,  the closing date of each
underwritten offering made pursuant to such Registration  Statement (or for such
shorter period as to which the managing underwriter or underwriters may agree).

     (ii).....The  Company agrees not to effect any Public Sale or  distribution
of its Common Stock,  or any  securities  convertible  into or  exchangeable  or
exercisable for such Common Stock, during the seven days prior to and during the
180-day  period  beginning  on the  effective  date of any  underwritten  Demand
Registration (or for such shorter period as to which the managing underwriter or
underwriters  may  agree),  except  as part of such  Demand  Registration  or in
connection with any employee benefit or similar plan, any dividend  reinvestment
plan, or a business acquisition or combination.

                  (e)  Registration  and Maintenance  Procedures.  In connection
with the  registration of any Registrable  Securities  and/or the maintenance of
the Shelf and/or any other  Registration  Statement,  the Company shall,  to the
extent applicable, at its own expense, as promptly as reasonably possible:

                                    (i)   Prepare   and  file  with  the  SEC  a
                  Registration  Statement or  Registration  Statements on a form
                  available  for the sale of the  Registrable  Securities by the
                  holders  thereof in  accordance  with the  intended  method of
                  distribution  thereof,  and use its reasonable best efforts to
                  cause each such Registration Statement to become effective;

                                    (ii)  Prepare  and  file  with  the SEC such
                  amendments and post-effective  amendments to each Registration
                  Statement  as may  be  necessary  to  keep  such  Registration
                  Statement  continuously  effective  for a period ending on the
                  earlier  of (x) 90 days from the  effective  date and (y) such
                  time  as all of  such  securities  have  been  disposed  of in
                  accordance  with the intended  method of disposition  thereof;
                  and cause the related  prospectus  to be  supplemented  by any
                  required prospectus  supplement,  and as so supplemented to be
                  filed pursuant to Rule 424 (or any similar  provisions then in
                  force)  under  the   Securities   Act;  and  comply  with  the
                  provisions  of the  Securities  Act,  the Exchange Act and the
                  rules  and  regulations  of  the  SEC  promulgated  thereunder
                  applicable  to it  with  respect  to  the  disposition  of all
                  securities  covered  by  such  Registration  Statement  as  so
                  amended or in such prospectus as so supplemented;






                                    (iii)   Notify  the   selling   Stockholders
                  promptly  (but in any event  within two  business  days),  and
                  confirm such notice in writing,  (A) when a prospectus  or any
                  prospectus  supplement  or  post-effective  amendment has been
                  filed,  and, with respect to a  Registration  Statement or any
                  post-effective  amendment, when the same has become effective,
                  (B) of the  issuance  by the SEC of any stop order  suspending
                  the effectiveness of a Registration  Statement or of any order
                  preventing   or   suspending   the  use  of  any   preliminary
                  prospectus,  (C) if at any time when a prospectus  is required
                  by the Securities Act to be delivered in connection with sales
                  of Registrable  Securities the Company  becomes aware that the
                  representations and warranties of the Company contained in any
                  agreement (including any underwriting  agreement) contemplated
                  by  Section  7(e)(viii)  cease to be true and  correct  in all
                  material  respects,  (D) of the  receipt by the Company of any
                  notification   with   respect   to  the   suspension   of  the
                  qualification   or   exemption   from   qualification   of   a
                  Registration  Statement or any of the  Registrable  Securities
                  for  offer  or sale in any  jurisdiction,  (E) if the  Company
                  becomes  aware of the  happening  of any event  that makes any
                  statement  made  in such  Registration  Statement  or  related
                  prospectus  or  any  document  incorporated  or  deemed  to be
                  incorporated  therein  by  reference  untrue  in any  material
                  respect or that  requires  the  making of any  changes in such
                  Registration  Statement,  prospectus  or documents so that, in
                  the case of such Registration  Statement,  it will not contain
                  any untrue  statement of a material  fact or omit to state any
                  material  fact  required to be stated  therein or necessary to
                  make the statements  therein not  misleading,  and that in the
                  case  of the  prospectus,  it  will  not  contain  any  untrue
                  statement  of a  material  fact or omit to state any  material
                  fact  required to be stated  therein or  necessary to make the
                  statements  therein, in light of the circumstances under which
                  they were made, not misleading;

                                    (iv)  Use its  reasonable  best  efforts  to
                  prevent the issuance of any order suspending the effectiveness
                  of a  Registration  Statement  or of any order  preventing  or
                  suspending   the  use  of  a  prospectus  or  suspending   the
                  qualification (or exemption from  qualification) of any of the
                  Registrable  Securities for sale in any jurisdiction,  and, if
                  any such order is issued, to obtain the withdrawal of any such
                  order at the earliest possible moment;

                                    (v) Deliver to each selling  Stockholder and
                  the  underwriters,  if any, without charge,  as many copies of
                  the  prospectus  or  prospectuses   (including  each  form  of
                  prospectus)  and each amendment or supplement  thereto as such
                  Persons  may  reasonably  request;  and,  the  Company  hereby
                  consents to the use of such  prospectus  and each amendment or
                  supplement thereto by each of the selling Stockholders and the
                  underwriters  or  agents,  if  any,  in  connection  with  the
                  offering  and sale of the  Registrable  Securities  covered by
                  such prospectus and any amendment or supplement thereto;

                                    (vi)  Prior  to  any  public   offering   of
                  Registrable Securities,  to use its reasonable best efforts to
                  register  or   qualify,   and   cooperate   with  the  selling
                  Stockholders,  the underwriters,  if any, the sales agents and
                  their  respective  counsel in connection with the registration
                  or  qualification  (or  exemption  from such  registration  or
                  qualification)  of such  Registrable  Securities for offer and
                  sale  under  the   securities  or  "blue  sky"  laws  of  such
                  jurisdictions within the United States as necessary;






                                    (vii)  Upon  the  occurrence  of  any  event
                  contemplated   by  Section   7(e)(iii)(E),   as   promptly  as
                  practicable  prepare a supplement or post-effective  amendment
                  to the  Registration  Statement or a supplement to the related
                  prospectus  or  any  document  incorporated  or  deemed  to be
                  incorporated therein by reference,  or file any other required
                  document so that, as thereafter delivered to the purchasers of
                  the  Registrable   Securities  being  sold  thereunder,   such
                  prospectus will not contain an untrue  statement of a material
                  fact or omit to state a material  fact  required  to be stated
                  therein or necessary to make the statements  therein, in light
                  of  the   circumstances   under  which  they  were  made,  not
                  misleading;

                                    (viii) Enter into an underwriting  agreement
                  in form,  scope and substance as is customary in  underwritten
                  offerings  and take all such other  actions as are  reasonably
                  requested  by the  managing  or sole  underwriter  in order to
                  expedite or facilitate the  registration or the disposition of
                  such Registrable Securities,  and in such connection, (A) make
                  such representations and warranties to the underwriters,  with
                  respect to the  business of the Company and its  Subsidiaries,
                  and the Registration  Statement,  prospectus and documents, if
                  any,  incorporated  or deemed to be  incorporated by reference
                  therein,  in each case,  in form,  substance  and scope as are
                  customarily  made by issuers to  underwriters  in underwritten
                  offerings,  and  confirm the same if and when  requested;  (B)
                  obtain  opinions of counsel to the Company and updates thereof
                  (which  counsel and  opinions (in form,  scope and  substance)
                  shall   be   reasonably    satisfactory    to   the   managing
                  underwriters),  addressed  to the  underwriters  covering  the
                  matters   customarily   covered  in  opinions   requested   in
                  underwritten  offerings  and  such  other  matters  as  may be
                  reasonably   requested  by  underwriters;   (C)  obtain  "cold
                  comfort"  letters and  updates  thereof  from the  independent
                  certified   public   accountants   of  the  Company  (and,  if
                  necessary,  any other independent certified public accountants
                  of any  Subsidiary of the Company or of any business  acquired
                  by the Company for which  financial  statements  and financial
                  data are, or are required to be, included in the  Registration
                  Statement),  addressed  to  each  of  the  underwriters,  such
                  letters to be in customary  form and  covering  matters of the
                  type   customarily   covered  in  "cold  comfort"  letters  in
                  connection  with  underwritten   offerings;   and  (D)  if  an
                  underwriting agreement is entered into, the same shall contain
                  indemnification provisions and procedures no less favorable to
                  the Stockholders than those set forth in Section 7(g) (or such
                  other  provisions  and  procedures  acceptable to holders of a
                  majority  of  the  Registrable   Securities  covered  by  such
                  Registration   Statement  and  the  managing  underwriters  or
                  agents) with respect to all parties to be indemnified pursuant
                  to Section 7(g). The above shall be done at each closing under
                  such underwriting  agreement, or as and to the extent required
                  thereunder;






                                    (ix)  Comply with all  applicable  rules and
                  regulations  of the SEC and make  generally  available  to its
                  Stockholders  earnings statements satisfying the provisions of
                  Section 11(a) of the  Securities  Act and Rule 158  thereunder
                  (or any similar rule promulgated  under the Securities Act) no
                  later than 45 days after the end of any 12-month period (or 90
                  days after the end of any 12-month  period if such period is a
                  fiscal year) (x)  commencing at the end of any fiscal  quarter
                  in which Registrable  Securities are sold to underwriters in a
                  firm commitment or best efforts underwritten  offering and (y)
                  if not sold to underwriters in such an offering, commencing on
                  the first day of the first fiscal quarter of the Company after
                  the   effectiveness   of  a  Registration   Statement,   which
                  statements shall cover said 12-month periods; and

                                    (x) Use its reasonable best efforts to cause
                  all such Registrable  Securities  covered by such Registration
                  Statement to be designated as a NASDAQ "national market system
                  security"  within the meaning of Rule 11Aa2-1 or listed on the
                  principal  securities  exchange on which  Common Stock is then
                  listed (if any).

The Company may require each  Stockholder as to which any  registration is being
effected to furnish to the Company such  information  regarding such Stockholder
and the  distribution  of such  Registrable  Securities as the Company may, from
time to time,  reasonably  request in writing;  provided  that such  information
shall be used only in connection with such registration. The Company may exclude
from  such  registration  the  Registrable  Securities  of any  Stockholder  who
unreasonably  fails to furnish such  information  promptly after  receiving such
request.  Each  Stockholder  agrees  that,  upon  receipt of any notice from the
Company  of the  happening  of  any  event  of the  kind  described  in  Section
7(e)(iii)(B),  7(e)(iii)(D) or  7(e)(iii)(E),  such  Stockholder  will forthwith
discontinue   disposition  of  such  Registrable   Securities  covered  by  such
Registration  Statement or prospectus  until such  Stockholder's  receipt of the
copies of the supplemented or amended  prospectus  contemplated by Section 7(e),
or until such  Stockholder  is advised in writing by the Company that the use of
the  applicable  prospectus  may be  resumed,  and has  received  copies  of any
amendments or supplements thereto.

     (f)  Registration   Expenses.   All  fees  and  expenses  incident  to  the
performance  of or compliance the Company with the provisions of Section 7 shall
be borne by the Company,  whether or not any Registration  Statement is filed or
becomes  effective,  including,  without  limitation,  (i) all  registration and
filing fees (including, without limitation, fees and expenses of compliance with
state securities or "blue sky" laws), (ii) reasonable  messenger,  telephone and
delivery expenses, (iii) fees and disbursements of counsel for the Company, (iv)
fees and disbursements of all independent  certified public accountants referred
to in  Section  7(e)(viii),  (v)  underwriters'  fees  and  expenses  (excluding
discounts,  commissions,  or  fees  of  underwriters,  selling  brokers,  dealer
managers  or  similar  securities   industry   professionals   relating  to  the
distribution of the Registrable  Securities,  which shall be paid by the selling
stockholders),  (vi)  Securities  Act  liability  insurance,  if the  Company so
desires such  insurance,  (vii)  internal  expenses of the  Company,  (viii) the
expense of any annual audit,  (ix) the fees and expenses  incurred in connection
with the listing of the securities to be registered on any securities  exchange,
and (x) the fees and expenses of any Person, including special experts, retained
by the  Company.  In  connection  with any  Demand  Registration  or  Incidental
Registration  hereunder,   the  Company  shall  reimburse  the  holders  of  the
Registrable  Securities being registered in such registration for the reasonable
fees and  disbursements of not more than one counsel  (together with appropriate
local counsel) chosen by Thayer,  if pursuant to a Demand  Registration,  or the
Company, in all other cases, and other reasonable  out-of-pocket expenses of the
Stockholders  incurred in connection  with the  registration  of the Registrable
Securities.






     (g) Indemnification; Contribution.

     (i)......The  Company shall,  without limitation as to time,  indemnify and
hold  harmless,  to the full extent  permitted  by law,  each  Stockholder,  the
officers,  directors, members, agents and employees of each of them, each Person
who  controls  each  such  Person  (within  the  meaning  of  Section  15 of the
Securities  Act or Section 20 of the Exchange  Act),  the  officers,  directors,
agents  and  employees  of each such  controlling  person and any  financial  or
investment adviser (each, an "Indemnified  Stockholder"),  to the fullest extent
lawful,  from and  against  any and all losses,  claims,  damages,  liabilities,
actions or  proceedings  (whether  commenced  or  threatened)  reasonable  costs
(including,  without limitation,  reasonable costs of preparation and reasonable
attorneys'  fees) and  reasonable  expenses  (including  reasonable  expenses of
investigation)  (collectively,  "Losses"), as incurred,  arising out of or based
upon any untrue or alleged untrue  statement of a material fact contained in any
Registration Statement,  prospectus or form of prospectus or in any amendment or
supplements thereto or in any preliminary prospectus, or arising out of or based
upon any omission or alleged  omission of a material  fact required to be stated
therein or necessary to make the statements  therein not  misleading,  except to
the extent, but only to the extent, that such untrue or alleged untrue statement
is  contained  in, or such  omission  or  alleged  omission  is  required  to be
contained  in, any  information  so  furnished in writing by the Company to such
Stockholder  expressly for use in such Registration  Statement or prospectus and
that such statement or omission was reasonably  relied upon by such  Stockholder
in preparation of such Registration Statement, prospectus or form of prospectus;
provided,  however, that the Company shall not be liable in any such case to the
extent that the Company has  furnished in writing to such  Stockholder  within a
reasonable period of time prior to the filing of any such Registration Statement
or prospectus or amendment or supplement thereto  information  expressly for use
in such  Registration  Statement or  prospectus  or any  amendment or supplement
thereto which corrected or made not misleading, information previously furnished
to such  Stockholder,  and such  Stockholder  failed to include such information
therein; provided, further, however, that the Company shall not be liable to any
Person who participates as an underwriter in the offering or sale of Registrable
Securities or any other Person, if any, who controls such underwriter(s)  within
the meaning of the  Securities  Act to the extent that any such Losses arise out
of or are based upon an untrue statement or alleged untrue statement or omission
or alleged omission made in any preliminary prospectus if (A) such Person failed
to send or deliver a copy of the  prospectus  with or prior to the  delivery  of
written  confirmation  of the sale by such  Person to the Person  asserting  the
claim from which such Losses arise, (B) the prospectus would have corrected such
untrue  statement  or  alleged  untrue  statement  or such  omission  or alleged
omission,  and (C) the Company has complied with its  obligations  under Section
7(e)(iii).  Each indemnity and  reimbursement of costs and expenses shall remain
in full force and effect regardless of any investigation made by or on behalf of
such Indemnified Stockholder.






     (ii).....In   connection  with  any  Registration   Statement  in  which  a
Stockholder is participating, such Stockholder, or an authorized officer of such
Stockholder,  shall  furnish to the Company in writing such  information  as the
Company  reasonably  requests  for  use  in  connection  with  any  Registration
Statement or prospectus and agrees,  severally and not jointly, to indemnify, to
the full extent permitted by law, the Company, its directors,  officers,  agents
and  employees,  each Person who  controls  the  Company  (within the meaning of
Section 15 of the  Securities  Act and Section 20 of the Exchange  Act), and the
directors,  officers,  agents or employees of such controlling persons (each, an
"Indemnified  Company",  and together  with the  Indemnified  Stockholders,  the
"Indemnified Parties"), from and against all Losses, as incurred, arising out of
or based  upon any  untrue  or  alleged  untrue  statement  of a  material  fact
contained in any Registration Statement,  prospectus or form of prospectus or in
any  amendment  or  supplements  thereto or in any  preliminary  prospectus,  or
arising out of or based upon any omission or alleged omission of a material fact
required to be stated  therein or necessary to make the  statements  therein not
misleading,  except to the extent,  but only to the extent,  that such untrue or
alleged untrue  statement is contained in, or such omission or alleged  omission
is required to be contained in, any  information so furnished in writing by such
Stockholder to the Company expressly for use in such  Registration  Statement or
prospectus and that such statement or omission was reasonably relied upon by the
Company in preparation  of such  Registration  Statement,  prospectus or form of
prospectus;  provided, however, that such Stockholder shall not be liable in any
such case to the extent that such  Stockholder  has  furnished in writing to the
Company  within a  reasonable  period  of time  prior to the  filing of any such
Registration   Statement  or  prospectus  or  amendment  or  supplement  thereto
information  expressly for use in such  Registration  Statement or prospectus or
any amendment or  supplement  thereto  which  corrected or made not  misleading,
information  previously  furnished  to the  Company,  and the Company  failed to
include such information therein. In no event shall the liability of any selling
Stockholder  hereunder be greater in amount than the after-tax  dollar amount of
the proceeds (net of payment of all expenses)  received by such Stockholder upon
the  sale of the  Registrable  Securities  giving  rise to such  indemnification
obligation.  Such indemnity shall remain in full force and effect  regardless of
any investigation made by or on behalf of such Indemnified Company.






     (iii)....Any  Indemnified  Party shall give  prompt  notice to the party or
parties from which such indemnity is sought (the "Indemnifying  Parties") of the
commencement of any action, suit,  proceeding or investigation or written threat
thereof (a  "Proceeding")  with  respect to which such  Indemnified  Party seeks
indemnification or contribution  pursuant hereto;  provided,  however,  that the
failure to so notify the Indemnifying Parties shall not relieve the Indemnifying
Parties  from  any  obligation  or  liability  except  to the  extent  that  the
Indemnifying  Parties have been  prejudiced  by such failure.  The  Indemnifying
Parties  shall  have the  right,  exercisable  by  giving  written  notice to an
Indemnified  Party  promptly  after the  receipt  of  written  notice  from such
Indemnified Party of such Proceeding,  to assume,  at the Indemnifying  Parties'
expense,   the  defense  of  any  such  Proceeding,   with  counsel   reasonably
satisfactory to such Indemnified Party;  provided,  however, that an Indemnified
Party or Indemnified  Parties (if more than one such Indemnified  Party is named
in any Proceeding)  shall have the right to employ separate  counsel in any such
Proceeding and to participate in the defense thereof,  but the fees and expenses
of such counsel shall be at the expense of such Indemnified Party or Indemnified
Parties  unless:  (x) the  Indemnifying  Parties  agree  to pay  such  fees  and
expenses;  (y) the  Indemnifying  Parties fail promptly to assume the defense of
such  Proceeding  or fail to  employ  counsel  reasonably  satisfactory  to such
Indemnified Party or Indemnified  Parties;  or (z) the named parties to any such
Proceeding (including any impleaded parties) include both such Indemnified Party
or Indemnified  Parties and the  Indemnifying  Parties,  and there may be one or
more defenses  available to such Indemnified  Party or Indemnified  Parties that
are different from or additional to those available to the Indemnifying Parties,
in which case, if such  Indemnified  Party or Indemnified  Parties  notifies the
Indemnifying Parties in writing that it elects to employ separate counsel at the
expense of the Indemnifying Parties, the Indemnifying Parties shall not have the
right to assume the defense  thereof and such counsel shall be at the expense of
the Indemnifying  Parties,  it being  understood,  however,  that,  unless there
exists a conflict among Indemnified Parties, the Indemnifying Parties shall not,
in connection with any one such Proceeding or separate but substantially similar
or related Proceedings in the same jurisdiction, arising out of the same general
allegations or  circumstances,  be liable for the fees and expenses of more than
one separate firm of attorneys  (together with appropriate local counsel) at any
time for such  Indemnified  Party or  Indemnified  Parties.  Whether or not such
defense is assumed by the Indemnifying  Parties,  such  Indemnifying  Parties or
Indemnified  Party or  Indemnified  Parties will not be subject to any liability
for any settlement  made without its or their consent (but such consent will not
be unreasonably  withheld).  The Indemnifying Parties shall not consent to entry
of any judgment or enter into any  settlement  which (A) provides for other than
monetary  damages  without the consent of the  Indemnified  Party or Indemnified
Parties  (which  consent shall not be  unreasonably  withheld or delayed) or (B)
does not include as an unconditional  term thereof the giving by the claimant or
plaintiff to such Indemnified Party or Indemnified Parties of a release, in form
and substance satisfactory to the Indemnified Party or Indemnified Parties, from
all liability in respect of such  Proceeding  for which such  Indemnified  Party
would be entitled to indemnification hereunder.

     (iv).....If  the  indemnification  provided  for in  this  Section  7(g) is
unavailable to an Indemnified  Party or is insufficient to hold such Indemnified
Party  harmless  for any  Losses in respect  of which  this  Section  7(g) would
otherwise apply by its terms, then each applicable  Indemnifying  Party, in lieu
of  indemnifying  such  Indemnified  Party,  shall  have  a  joint  and  several
obligation to contribute to the amount paid or payable by such Indemnified Party
as a result of such Losses,  in such proportion as is appropriate to reflect the
relative fault of and relative  benefit to the  Indemnifying  Party,  on the one
hand,  and such  Indemnified  Party,  on the other hand, in connection  with the
actions,  statements  or omissions  that  resulted in such Losses as well as any
other relevant equitable considerations. The relative fault of such Indemnifying
Party,  on the one hand,  and  Indemnified  Party,  on the other hand,  shall be
determined by reference to, among other things,  whether any action in question,
including any untrue or alleged untrue  statement of a material fact or omission
or alleged  omission to state a material  fact, has been taken by, or relates to
information  supplied by, such Indemnifying  Party or Indemnified Party, and the
parties'  relative intent,  knowledge,  access to information and opportunity to
correct or prevent any such action,  statement  or omission.  The amount paid or
payable  by a party as a result of any  Losses  shall be deemed to  include  any
legal or other fees or expenses  incurred by such party in  connection  with any
Proceeding,  to the extent  such  party  would  have been  indemnified  for such
expenses if the indemnification  provided for in Section 7(g)(i) or 7(g)(ii) was
available to such party.  The parties hereto agree that it would not be just and
equitable if contribution  pursuant to this Section  7(g)(iv) were determined by
pro-rata  allocation  or by any other  method of  allocation  that does not take
account of the equitable  considerations  referred to in this Section  7(g)(iv).
Notwithstanding  the provisions of this Section 7(g)(iv),  an Indemnifying Party
that is a selling  Stockholder shall not be required to contribute any amount in
excess of the  amount  by which  the net  after-tax  proceeds  received  by such
Indemnifying  Party  exceeds  the amount of any damages  that such  Indemnifying
Party has  otherwise  been  required to pay by reasons of such untrue or alleged
untrue statement or omission or alleged omission. No person guilty of fraudulent
misrepresentation  (within the meaning of Section 11(f) of the  Securities  Act)
shall be  entitled  to  contribution  from any Person who was not guilty of such
fraudulent misrepresentation.






     (h) Rule 144 Sales. The Company shall file the reports required to be filed
by it  under  the  Securities  Act  and the  Exchange  Act  and  the  rules  and
regulations  promulgated  thereunder,  and will take such further  action as any
Stockholder may reasonably request, all to the extent required from time to time
to enable such  Stockholder to sell Registrable  Securities  (subject to Section
3(b)(vii) or 3(b)(viii))  without  registration  under the Securities Act within
the limitation of the  exemptions  provided by Rule 144. Upon the request of any
Stockholder,  the Company shall deliver to such Stockholder a written  statement
as to whether it has complied with such requirements.

     (i)  Underwritten  Registrations.  No  Stockholder  may  participate in any
underwritten  registration  hereunder unless such Stockholder (x) agrees to sell
such  Stockholder's   Registrable  Securities  on  the  basis  provided  in  any
underwriting  arrangements approved by the Persons entitled hereunder to approve
such arrangements and (y) completes and executes all  questionnaires,  powers of
attorney,  indemnities,  underwriting  agreements and other  documents  required
under the terms of such underwriting arrangements.

     (j) No  Inconsistent  Agreements.  The Company has not and will not,  enter
into any agreement with respect to the Company's securities that is inconsistent
with the  rights  granted to the  Stockholders  in this  Section 7 or  otherwise
conflicts with the provisions hereof.

     (k) S-3 Demands.

     (i)......So  long as (A) any Thayer  Shares are not  included  in the Shelf
and/or the Shelf is not then  effective  and (B) the Company is permitted  under
Securities Act to register  securities on Form S-3,  Thayer shall have the right
to request  registration  on Form S-3 of all or any  portion of the  Registrable
Securities  held by Thayer and its Affiliates (in each case,  referred to herein
as the "S-3 Requesting  Holders") by delivering a written notice to the Company,
which notice  identifies the S-3 Requesting  Holders and specifies the number of
Registrable   Securities  to  be  included  in  such   registration   (the  "S-3
Registration Request").  The Company will give prompt written notice of such S-3
Registration  Request (the "S-3 Registration  Notice") to all other Stockholders
and will thereupon use its reasonable best efforts to effect the registration (a
"S-3 Demand Registration") on Form S-3 of:

          (x) the Registrable  Securities  requested to be registered by the S-3
     Requesting Holders; and

          (y) all other Registrable  Securities which the Company has received a
     written  request from another  Stockholder to register within 30 days after
     the S-3 Registration Notice is given.

The  Company  shall be  obligated  to effect an  unlimited  number of S-3 Demand
Registrations.   S-3   Demand   Registrations   shall  not   constitute   Demand
Registrations.






     (ii).....If the sole or managing  underwriter of a S-3 Demand  Registration
advises  the Company in writing  that in its  opinion the number of  Registrable
Securities and other  securities  requested to be included exceeds the number of
Registrable  Securities and other  securities which can be sold in such offering
without  adversely  affecting the  distribution of the securities being offered,
the price that will be paid in such offering or the marketability  thereof,  the
Company will include in such  registration  the greatest  number of  Registrable
Securities proposed to be registered by the Stockholders which in the opinion of
such  underwriter can be sold in such offering without  adversely  affecting the
distribution  of the securities  being  offered,  the price that will be paid in
such  offering or the  marketability  thereof,  ratably  among the  Stockholders
proposing to register based on each such Stockholder's Ownership Percentage.

                  Section  8.........Operating Budget. Norton hereby agrees that
he shall  not  accept or  attempt  to  collect  from the  Company  or any of its
Subsidiaries  any bonus otherwise do to him under any employment,  consulting or
other similar  agreement  between the Company and any  Subsidiary and him if the
Company is at the time or had been within the  preceding two years in default of
its obligations under Section 4A(i)(c), 4A(i)(d) or 4A(i)(e) of the Common Stock
Purchase  Agreement and such default in the case of Section 4A(i)(c) or 4A(i)(d)
of the Common  Stock  Purchase  Agreement  remains or  remained  uncured  for 20
business days and in the case of Section  4A(i)(e) of the Common Stock  Purchase
Agreement remains or remained uncured for 5 business days.

                  Section  9.........Redemption.  Subject to the  limitations on
transferring Common Shares to the Company set forth in Section 3(b)(iii),  prior
to  redeeming,  purchasing or otherwise  acquiring  (contingent  or  otherwise),
directly or  indirectly,  or entering  into any  agreement  for the  redemption,
purchase or acquisition  (contingent or otherwise),  directly or indirectly,  of
any Common Shares from any holder of Management  Shares,  the Company shall give
at least  thirty (30) days prior  written  notice to Thayer,  which  notice (for
purposes of this Section 9, the "Redemption Notice") shall identify the type and
amount of Common  Shares to be redeemed,  describe the terms and  conditions  of
such proposed redemption, and identify each prospective transferor of the Common
Shares to be redeemed (the "Other  Redeemers").  Thayer or any of its Affiliates
may, within fifteen (15) days after the receipt of the Redemption  Notice,  give
written notice (each, a "Co-Redemption  Notice") to the Company that such Person
wishes to participate in such proposed  redemption upon the terms and conditions
set forth in the Redemption Notice, which Co-Redemption Notice shall specify the
type and amount of Common  Shares  such  Person  desires  to redeem.  If none of
Thayer and its Affiliates give the Company a timely  Co-Redemption  Notice, then
the Company may redeem such Common Shares on the terms and  conditions set forth
in the Redemption  Notice of the Other  Redeemers at any time within ninety days
after expiration of the fifteen-day period for giving Co-Redemption Notices with
respect to such  redemption.  Any such Common Shares not redeemed by the Company
during such  ninety-day  period will again be subject to the  provisions of this
Section 9 upon a subsequent redemption. If Thayer and/or its Affiliates give the
Company a timely  Co-Redemption  Notice, then the Company, at its option,  shall
(a)  redeem  all  Common  Shares  which  Thayer,  its  Affiliates  and the Other
Redeemers desire to redeem,  or (b) allocate the maximum number of each class of
Common  Shares that the Company is willing to redeem (the  "Redeemable  Shares")
among Thayer, its Affiliates and the Other Redeemers as follows:






                           (i) each  Stockholder  holding Thayer Shares shall be
         entitled to redeem a number of Common  Shares  (not to exceed,  for any
         such Stockholder, the number of shares of such Common Shares identified
         in such Stockholder's Co-Redemption Notice) equal to the product of (A)
         the number of Redeemable  Shares of such class of Common Shares and (B)
         such Stockholder's Ownership Percentage of such class of Common Shares;
         and

                           (ii) the Other  Redeemers shall be entitled to redeem
         all Redeemable  Shares  remaining  after taking into account clause (i)
         above (with the allocation  among the Other Redeemers as decided by the
         Company in its sole discretion).

                  Section 10........Rights of First Refusal or First Offer.

                  (a) Assignment.  Except with respect to the Irrevocable  Proxy
and Stock Rights Agreement, each of the Management Stockholders hereby agrees to
assign, or cause to be assigned, to Thayer or any Affiliate of Thayer designated
by Thayer any right of first refusal or first offer or any  preemptive  right of
any kind with respect to any Common Shares granted to or otherwise controlled by
such  Management  Stockholder or any Affiliate of such  Management  Stockholder,
including any such right hereafter created,  under any agreement other than this
Agreement,  the Common Stock Purchase  Agreement or the Stock Purchase  Warrant;
provided,  however that (i) if such right is not  assignable  for any reason and
(ii) there is no prohibition  under such right or by law against the Transfer to
Thayer or any  Affiliate  of Thayer  designated  by Thayer of the Common  Shares
underlying such right immediately  after the exercise thereof,  then at Thayer's
request and expense,  such  Management  Stockholder  shall,  or shall cause such
Management  Stockholder's  Affiliate  to,  exercise  such right and  immediately
thereafter  Transfer to Thayer or any  Affiliate of Thayer  designated by Thayer
the  Common  Shares   purchased  under  such  right.   Each  of  the  Management
Stockholders  hereby agrees to notify Thayer as soon as practical upon receiving
notice  from any  Person  or  otherwise  becoming  aware  that  such  Management
Stockholder or any Affiliate of such Management  Stockholder has any exercisable
or soon  to be  exercisable  right  of  first  refusal  or  first  offer  or any
preemptive right of any kind with respect to any Common Shares.

                  (b)  Irrevocable  Proxy and  Stock  Rights  Agreement.  Norton
hereby  agrees  that if Norton  elects not to exercise  his "right to  purchase"
pursuant to Article 3 of the Irrevocable Proxy and Stock Rights Agreement,  then
Norton shall assign such right to purchase to Thayer or any  Affiliate of Thayer
designated by Thayer;  provided,  however that  notwithstanding  anything in the
Irrevocable Proxy and Stock Rights Agreement to the contrary, the purchase price
per share with respect to such assigned right to purchase shall be Market Value.
Norton hereby agrees to notify Thayer as soon as practical upon receiving notice
from any Person or otherwise  becoming aware that Norton has any  exercisable or
soon to be exercisable  right to purchase under the Irrevocable  Proxy and Stock
Rights Agreement.

                  Section  11........Amendment  and Waiver.  Except as otherwise
provided herein, no amendment or waiver of any provision of this Agreement shall
be effective against the Company or Stockholders unless such amendment or waiver
is  approved  in writing by the  Company,  Thayer and the  holders of at least a
majority of the then-outstanding  Management Shares. The failure of any party to
enforce any  provision of this  Agreement  shall not be construed as a waiver of
such  provision  and shall not  affect  the right of such  party  thereafter  to
enforce each provision of this Agreement in accordance with its terms.






                  Section  12........Severability.  If  any  provision  of  this
Agreement is held to be invalid,  illegal or  unenforceable in any respect under
any applicable law or rule in any jurisdiction,  such invalidity,  illegality or
unenforceability shall not affect any other provision or any other jurisdiction,
but  this  Agreement   shall  be  reformed,   construed  and  enforced  in  such
jurisdiction as if such invalid,  illegal or  unenforceable  provision had never
been contained herein.

                  Section  13........Entire   Agreement.   Except  as  otherwise
expressly set forth herein,  this document  embodies the complete  agreement and
understanding among the parties hereto with respect to the subject matter hereof
and   supersedes   and  preempts  any  prior   understandings,   agreements   or
representations by or among the parties, written or oral, which may have related
to the subject matter hereof in any way.

                  Section 14........Successors and Assigns. This Agreement shall
bind and inure to the  benefit  of and be  enforceable  by the  Company  and the
Stockholders  and their respective  permitted  successors and assigns so long as
such  Stockholders  and their respective  permitted  successors and assigns hold
Stockholder  Shares,  provided,  however  that  Thayer  shall  not  assign  this
Agreement  or any of the  rights or  interests  hereunder  (except  any right or
interest  directly  related to the ownership of the Common Shares) to any Person
other than an Affiliate of Purchaser within two years of the date hereof.

                  Section 15........Counterparts. his  Agreement may be executed
in separate  counterparts  each of which shall be an original and all of which
taken together shall constitute one and the same agreement.

                  Section  16........Remedies.  The Company and the Stockholders
shall be entitled to enforce their rights under this Agreement  specifically  to
recover  damages by reason of any breach of any provision of this  Agreement and
to exercise all other rights  existing in their favor.  The parties hereto agree
and acknowledge  that money damages may not be an adequate remedy for any breach
of the provisions of this Agreement and that the Company or any  Stockholder may
in its  sole  discretion  apply  to any  court  of law or  equity  of  competent
jurisdiction for specific  performance and/or injunctive relief (without posting
a bond or other  security)  in order to enforce or prevent any  violation of the
provisions of this Agreement.

                  Section  17........Notices.  Any notice  provided  for in this
Agreement shall be in writing and shall be either personally delivered,  or sent
via facsimile, or mailed first class mail (postage prepaid) or sent by reputable
overnight courier service (charges prepaid) to such Person as follows:

              if to the Company:

                       MLC Holdings, Inc.
                       11150 Sunset Hills Road, Suite 110
                       Reston, VA 20190-5321
                       FAX:.....        703-834-5718
                       Attention:       Phillip G. Norton






              with a copy to:

                       Alston & Bird, LLP
                       601 Pennsylvania Avenue, N.W.
                       North Building, 11th Floor
                       Washington, DC 20004
                       FAX:.....        202-508-3333
                       Attention:       Frank M. Conner, III, Esq.

              if to Thayer:

                       c/o Thayer Equity Investors III, L.P.
                       1455 Pennsylvania Avenue, Suite 350
                       Washington, DC 20004
                       FAX:.....        202-371-0391
                       Attention:       Carl J. Rickertsen

              with a copy to:

                       Kirkland & Ellis
                       655 Fifteenth Street, N.W., Suite 1200
                       Washington, DC  20005-5793
                       FAX:             202-879-5200
                       Attention:       Jack M. Feder, Esq.

              if to a Management Stockholder:

                       at the address set forth below such Management
                       Stockholder's signature on the signature page hereto

              if to any Person who becomes a Party hereto after the date hereof:

                       at the address set forth below such  Person's  signature
                       on the  signature  page to such  Person's  Joinder
                       Agreement;

or at such address or to the  attention  of such other  Person as the  recipient
party has specified by prior written notice to the sending  party.  Notices will
be deemed to have been given  hereunder  when  delivered  personally or sent via
facsimile  (against receipt  therefor),  five business days after deposit in the
U.S. mail and one business day after deposit with a reputable  overnight courier
service.   

     Section 18........Governing Law. The corporate law of Delaware shall govern
all issues  concerning the relative rights of the Company and its  stockholders.
All other questions concerning the construction,  validity and interpretation of
this  Agreement  shall  be  governed  by the  internal  law,  and not the law of
conflicts, of Delaware.






     Section  19........Descriptive  Headings.  The descriptive headings of this
Agreement are inserted for convenience only and do not constitute a part of this
Agreement.

     Section  20........Survival;  Termination.  Common  Shares  acquired by the
Stockholders  after the date hereof shall be Stockholder  Shares and hence fully
subject to the provisions of this Agreement.  Stockholder  Shares shall cease to
be such as provided in the last sentence of Section 3(b). Sections 2, 5, 6, 7, 8
and 9 hereof shall terminate upon Thayer Shares constituting less than 5% of the
issued and outstanding  Common Shares, and such sections shall remain terminated
even if Thayer, its Affiliates and any holders of Thayer Shares later own in the
aggregate 5% or more of the issued and outstanding Common Shares;  provided that
the limited  partners of Thayer Equity  Investors III, L.P. shall not be treated
as Affiliates of Thayer or the holders of Thayer Shares for the purposes of this
Section 20. Any prohibition  against Transfers without the prior written consent
of Thayer if such Transfers would result in Management Shares and Thayer Shares,
collectively, constituting less than 51% of the outstanding Common Shares of the
Company shall terminate upon Management Shares and Thayer Shares,  collectively,
constituting less than 35% of the outstanding Common Shares of the Company.  All
rights and obligations of the  Stockholders and the Company shall terminate upon
the  first  to  occur  of (i)  there  being  no  Thayer  Shares,  and  (ii)  the
consummation of an Approved Sale.

     Section  21........Other   Registration  Rights.  Each  of  the  Management
Stockholders  hereby  agrees  to waive  any  right to  demand  that the  Company
register any Common Shares under the Securities Act or include any Common Shares
in the Shelf or other registration statement and any other registration right of
any kind  granted  by the  Company  to such  Management  Stockholder  under  any
agreement other this Agreement.

                                  [END OF PAGE]
                            [SIGNATURE PAGES FOLLOW]








                                       
DOCUMENT3

                  IN  WITNESS   WHEREOF,   the  parties   have   executed   this
Stockholders Agreement as of the date first above written.

                  MLC HOLDINGS, INC.



                  By:      /s/ PHILLIP G. NORTON
                  ------------------------------
                           Name:    Phillip G. Norton
                           Title:   President and Chief Executive Officer

                  TC LEASING, LLC

                  By:      THAYER EQUITY INVESTORS III, L.P., 
                           its managing member

                  By:      TC EQUITY PARTNERS, L.L.C., its general partner


                  By:      /s/JEFFREY W. GOETTMAN
                  ------------------------------
                           Name:  Jeffrey W. Goetmann
                           Title:

                   /s/ PHILLIP G. NORTON 
                  ---------------------------------------
                           PHILLIP G. NORTON
                  Address: ___________________________

                           ___________________________
                                    
                  FAX:     ___________________________


                  /s/ BRUCE M. BOWEN
                  -----------------
                           BRUCE M. BOWEN
                  Address: ___________________________

                           ___________________________

                  FAX:     ___________________________









                   JAP INVESTMENT GROUP, L.P.

                   By:      J.A.P., Inc., its general partner


                   By:      /s/ PHILLIP G. NORTON
                         _________________________________
                            Name:    Phillip G. Norton
                            Title:







                    /s/ KEVIN M. NORTON
                     ---------------------------------------
                              KEVIN M. NORTON
                     Address: ___________________________
                         
                              ___________________________
                                       
                     FAX:     ___________________________

                    /s/ PATRICK J. NORTON, JR.
                     ---------------------------------------
                              PATRICK J. NORTON, JR.
                     Address: ___________________________
                                       
                              ___________________________

                     FAX:     ___________________________








                                   SCHEDULE I

                          OTHER MANAGEMENT STOCKHOLDERS


JAP Investment Group, L.P.
Kevin M. Norton
Patrick J. Norton, Jr.






                                    

                                 FORM OF JOINDER
                                       TO
                              STOCKHOLDERS AGREEMENT



                  This Joinder (this "Agreement") is made as of the date written
below by the undersigned  (the "Joining  Party") in favor of and for the benefit
of MLC Holdings,  Inc., TC Leasing,  LLC, the  Management  Stockholders  and the
other parties to the Stockholders  Agreement,  dated as of October 23, 1998 (the
"Stockholders  Agreement").  Capitalized terms used but not defined herein shall
have the meanings given such terms in the Stockholders Agreement.

                  The Joining  Party  hereby  acknowledges,  agrees and confirms
that,  by his or her  execution  of this  Agreement,  the Joining  Party will be
deemed to be a party to the  Stockholders  Agreement  and shall  have all of the
obligations  of a  Stockholder  thereunder  as if he or  she  had  executed  the
Stockholders  Agreement.  The  Joining  Party  hereby  ratifies,  as of the date
hereof,  and agrees to be bound by, all of the terms,  provisions and conditions
contained in the Stockholders Agreement.

                  IN WITNESS WHEREOF,  the undersigned has executed this Joinder
as of the date written below.


                                      ------------------------------------------
                                      Name:    _________________________________
                                      Date:    _________________________________
                                      Address: _________________________________
                                               _________________________________
                                               
                                      FAX:     _________________________________