1
                                                                   EXHIBIT 10.10


OBLIGOR FILE  NAME    OBLIGOR #     OBLIGATION NUMBER     OFFICER #      AMOUNT

Neural Applications
Corporation                                               32162    $3,000,000.00
- --------------------------------------------------------------------------------
                                                               Chicago, Illinois

                                                   Dated as of November 28, 1997
                                                               -----------  ----


                                  MASTER NOTE

                  (CORPORATION, PARTNERSHIP, OR JOINT VENTURE)

This Note has been executed by Neural Applications Corporation, a corporation
formed under the laws of the State of Delaware ("Borrower"); if more than one
entity executes this Note, the term "Borrower" refers to each of them
individually and some or all of them collectively, and their obligations
hereunder shall be joint and several.* If a land trustee executes this Note,
"Borrower" as used in sections 6 and 7 below also includes any beneficiary(ies)
of the land trust.**

     FOR VALUE RECEIVED, on or before November 2, 2002, the scheduled maturity
date hereof, Borrower promises to pay to the order of THE NORTHERN TRUST
COMPANY, an Illinois banking corporation (hereafter, together with any
subsequent holder hereof, called "Lender"), at its main banking office at 50
South LaSalle Street, Chicago, Illinois 60675, or at such other place as Lender
may direct, the aggregate unpaid principal balance of each advance (a "Loan"
and collectively the "Loans") made by Lender to Borrower hereunder. The total
principal amount of Loans outstanding at any one time hereunder shall not
exceed Three Million and 00/100 UNITED STATES DOLLARS ($3,000,000.00).

     Lender is hereby authorized by Borrower at any time and from time to time
at Lender's sole option to attach a schedule (grid) to this Note and to endorse
thereon notations with respect to each Loan specifying the date and principal
amount thereof, the Interim Maturity Date (as defined below) (if applicable),
the applicable interest rate and rate option, and the date and amount of each
payment of principal and interest made by Borrower with respect to each such
Loan. Lender's endorsements as well as its records relating to Loans shall be
rebuttably presumptive evidence of the outstanding principal and interest on
the Loans, and, in the event of inconsistency, shall prevail over any records
of Borrower and any written confirmations of Loans given by Borrower.

     If Borrower wishes to obtain a Loan under this Note, Borrower shall notify
Lender orally or in writing on a banking day. Any such notice shall be
irrevocable; if the notice is received after 10:00 AM Chicago time the Loan may
not be available until the next banking day. Additional procedures for "Bank
Offered Rate" Loans, if available, are set forth below.

     Each request for a Loan shall be deemed to be a representation and
warranty by Borrower to Lender that: (i) no Event of Default or Unmatured Event
of Default (in each case as defined below) has occurred and is continuing as of
the date of such request or would result from the making of the Loan; and (ii)
Borrower's representations and warranties herein are true and correct as of
such date as though made on such date. Upon receipt of each Loan request Lender
in its sole discretion shall have the right to request that Borrower provide to
Lender, prior to Lender's funding of the Loan, a certificate executed by
Borrower's President, Treasurer, or Chief Financial Officer (if Borrower is a
corporation), or a general partner or joint venturer of Borrower (if Borrower is
a partnership or joint venture) to such effect.


1.   INTEREST.
     Borrower agrees to pay interest on the unpaid principal amount from time
to time outstanding hereunder at the following rate per year: [CHECK ONE ONLY]

[X]       (i) The "Prime-Based Rate", which shall mean the Prime Rate plus one
          percent (1.00%).

[N/A]     ***(ii) The "Bank Offered Rate", which shall be equal to that rate of
          interest offered by Lender and accepted by Borrower and fixed for
          periods of up to one year ("Interest Period(s)") (the last day of any
          Interest Period being referred to as an "Interim Maturity Date").
          Other description_____________________________________________________
          _____________________________________________________________________.

"Prime Rate" means that rate of interest announced from time to time by Lender
called its prime rate, which rate may not at any time be the lowest rate
charged by Lender. Changes in the rate of interest on the Loans resulting from
a change in the Prime Rate shall take effect on the date set forth in each
announcement of a change in the Prime Rate.

     Without limiting Borrower's obligation to repay all outstanding Loans in
full on the scheduled maturity date, each Loan at the Bank Offered Rate shall
be due and payable in full on its Interim Maturity Date. After the maturity of
any Loan, whether by acceleration or otherwise, such Loan shall bear interest
until paid, at a rate equal to two percent (2%) in addition to the rate in
effect immediately prior to maturity (but not less than the Prime Rate in
effect at maturity).

     If this Note bears interest at the Bank Offered Rate and Borrower requests
a Loan, Lender shall in its sole discretion offer or decline to offer a Bank
Offered Rate (and if it offers a Bank Offered Rate, the rate of such Bank
Offered Rate shall be in Lender's sole discretion), and Borrower shall
irrevocably accept or decline such particular Bank Offered Rate and the related
Loan and confirm such acceptance in writing by letter or other written
communication dated and sent the date of such borrowing. Any confirmation by
Lender of the rate and Interest Period for any Bank Offered Rate Loan shall be
conclusive in the absence of manifest error. Without limiting Borrower's
obligations under any other document or instrument, Lender may rely without
inquiry upon any person whom it reasonably believes to be a party authorized to
accept or decline such Bank Offered Rate and the related Loan. Lender has no
obligation to make a new Loan to Borrower when a Loan at the Bank Offered Rate
matures on its Interim Maturity Date.

     Interest shall be computed for the actual number of days elapsed on the
basis of a year consisting of 360 days, including the date a Loan is made and
excluding the date a Loan or any portion thereof is paid or prepaid. Interest
shall be due and payable as follows:

[X]       Monthly, on the last day of each month, beginning December 31, 1997,
          with all accrued but unpaid interest being due and payable in full
          with the final principal payment due hereunder.

[N/A]     Quarterly, on the ________ day of each ___________, ____________,
          ________________, and _____________________ in each year, beginning
          ____________________, with all accrued but unpaid interest being due
          and payable in full with the final principal payment due hereunder.

[N/A]     Other _______________________________________________________________.



*Insert "N/A" in any blank in this Note which is not applicable. **Land trustee
may not sign upon direction of individual beneficiary(ies) unless Loans are for
business purposes. ***Do not use if collateral includes real estate.

   2
In addition, if the Bank Offered Rate is available under this Note, interest on
any Loan at the Bank Offered Rate, if not otherwise previously due and payable
as indicated above, shall be due and payable in full on the last day of each
Interest Period. After maturity interest shall be payable on demand.

2.   PREPAYMENTS.

     Borrower may prepay without penalty or premium any principal bearing
interest at the Prime-Based Rate. If Borrower prepays any principal bearing
interest at the Bank Offered Rate in whole or in part, or if the maturity of any
such Bank Offered Rate principal is accelerated, then, to the fullest extent
permitted by law Borrower shall also pay Lender for all losses (including but
not limited to interest rate margin and any other losses of anticipated
profits) and expenses incurred by reason of the liquidation or re-employment of
deposits acquired by Lender to make the Loan or maintain principal outstanding
at the Bank Offered Rate. Upon Lender's demand in writing specifying such
losses and expenses, Borrower shall promptly pay them; Lender's specification
shall be deemed correct in the absence of manifest error. Each Loan bearing
interest at the Bank Offered Rate shall be conclusively deemed to have been
funded by or on behalf of Lender by the purchase of a deposit corresponding in
amount to such Loan and in maturity to the Interest Period specified by Lender.

3.   REFERENCES TO PREVIOUS NOTES, FACILITY TYPE, COLLATERAL, GUARANTIES, LOAN
& OTHER AGREEMENTS. (CHECK AS APPLICABLE)

LINE OF CREDIT: This Note has been executed pursuant to a line of credit. At
the present time Lender intends to make available to Borrower credit as
outlined herein or in any related letter until the maturity day indicated above
unless in Lender's sole judgment there has occurred an adverse change in the
assets, condition or prospects of Borrower or any guarantor. THE LINE OF CREDIT
MAY BE CANCELLED OR REDUCED BY LENDER AT LENDER'S SOLE OPTION WITHOUT PRIOR
NOTICE TO BORROWER OR ANY OTHER PERSON OR ENTITY. THE LINE OF CREDIT IS
REVOCABLE NOTWITHSTANDING PAYMENT OF ANY FEES OR MAINTENANCE OF ANY ACCOUNT
BALANCES, AS AND IF PROVIDED IN ANY ACCOMPANYING LETTER OR OTHER DOCUMENT
PERTAINING TO SUCH FEES AND/OR BALANCES. Any such fees and/or balances shall be
deemed compensation to Lender for being prepared to respond to Borrower's
requests for credit under this Note.

[X]  This Note amends, restates, renews and replaces in its entirety the note
dated October 1, 1997 in the amount of $7,000,000.00, and any previously
renewed note(s). Borrower hereby expressly confirms that all collateral and
guaranties given for such prior note(s) shall secure or guarantee this Note.
All amounts outstanding under such previous note(s) shall be deemed
automatically outstanding hereunder.

[X]       This Note is secured without limitation as provided in the following
and all related documents, in each case as amended, modified, renewed, restated
or replaced from time to time:

     [N/A]     Security Agreement dated as of _________________________________.

     [N/A]     Mortgage dated as of ____________________________________________
               on property all or part of which is commonly known as ___________
               _________________________________________________________________
               ________________________________________________________________.

     [X]       Pledge Agreement dated as of 2/26/1996.

     [N/A]     Other (describe)_________________________________________________
               ________________________________________________________________.

[X]       Payment of this Note has been unconditionally guaranteed by Robert B.
Staib (each individually and all collectively referred to as "guarantor") as
provided in separately executed guaranties.

[N/A]     This Note has been executed pursuant to a __________ Agreement, dated
as of the date hereof, as amended, modified, restated, renewed, or replaced
from time to time, containing covenants and other terms, to which reference is
hereby made.

4.   USE OF PROCEEDS. CHECK ONE:

[X]       Borrower represents and warrants that the proceeds of this Note will
be used solely for business purposes, and not for personal, family or household
use, within the meaning of Federal Truth-in-Lending and similar state laws and
regulations.

[N/A]     ****Borrower represents that the proceeds of this Note will be used
for personal, family or household use. IF THIS OPTION IS CHECKED, THE FIRST
LOAN MUST BE IN THE AMOUNT OF $25,001 OR MORE

If Loan proceeds will be used to purchase or refinance the purchase of any
property describe:

                                      N/A
                                      N/A

Notwithstanding any other provision hereof, if this Note is covered by
Regulation Z of the Federal Reserve Board (Truth in Lending) or any like
disclosure requirement, this Note shall be secured by collateral referenced
herein or in any other document only if disclosed in a related disclosure
statement.

5.   REPRESENTATIONS.

Borrower hereby represents and warrants to Lender that:

     (a) Borrower and any "Subsidiary" (as defined below) are existing and in
     good standing under the laws of their state of formation, are duly
     qualified, in good standing and authorized to do business in each
     jurisdiction where failure to do so might have a material adverse impact on
     the consolidated assets, condition or prospects of Borrower; the execution,
     delivery and performance of this Note and all related documents and
     instruments are within Borrower's powers and have been authorized by all
     necessary corporate, partnership or joint venture action;

     (b) the execution, delivery and performance of this Note and all related
     documents and instruments have received any and all necessary governmental
     approval, and do not and will not contravene or conflict with any provision
     of law or of the partnership or joint venture or similar agreement, charter
     or by-laws of Borrower or any agreement affecting Borrower or its property;
     and

     (c) there has been no material adverse change in the business, condition,
     properties, assets, operations or prospects of Borrower or any guarantor
     since the date of the latest financial statements provided on behalf of
     Borrower or any guarantor to Lender prior to the execution of this Note.

"Subsidiary" means any corporation, partnership, joint venture, trust, or other
legal entity of which Borrower owns directly or indirectly fifty percent (50%)
or more of the outstanding voting stock or interest, or of which Borrower has
effective control, by contract or otherwise.

6.   EVENTS OF DEFAULT. The occurrence of any of the following shall constitute
an "Event of Default":

     (a) failure to pay, when and as due, any principal, interest or other
amounts payable hereunder; failure to comply with or perform any agreement or
covenant of Borrower contained herein; or failure to furnish (or caused to be
furnished to) Lender when and as requested by Lender (but not more often than
once every twelve months) fully completed personal financial statement(s) of
any individual guarantor on Lender's then-standard form together with such
supporting information as Lender may reasonably request; or

     (b) any default, event of default, or similar event shall occur or
continue under any other instrument, document, note, agreement, or guaranty
delivered to Lender in connection with this Note, or any such instrument,
document, note, agreement, or guaranty shall not be, or shall cease to be,
enforceable in accordance with its terms; or

     (c) there shall occur any default or event of default, or any event or
condition that might become such with notice or the passage of time or both, or
any similar event, or any event that requires the prepayment of borrowed money
or the acceleration of the maturity thereof, under the terms of any evidence of
indebtedness or other agreement issued or assumed or entered into by Borrower,
any Subsidiary, any general partner or joint venturer of Borrower, or any
guarantor, or under the terms of any indenture, agreement, or instrument under
which any such evidence of indebtedness or other agreement is issued, assumed,
secured, or guaranteed, and such event shall continue beyond any applicable
period of grace; or

     (d) any representation, warranty, schedule, certificate, financial
statement, report, notice, or other writing furnished by or on behalf of
Borrower, any Subsidiary, any general partner or joint venturer of Borrower, or
any guarantor to Lender is false or misleading in any material respect on the
date as of which the facts therein set forth are stated or certified; or

     (e) any guaranty of or pledge of collateral security for this Note shall
be repudiated or become unenforceable or incapable of performance; or

     (f) Borrower or any Subsidiary shall fail to maintain their existence in
good standing in their state of formation or shall fail to be duly qualified,
in good standing and authorized to do business in each jurisdiction where
failure to do so might have a material adverse impact on the consolidated
assets, condition or prospects or Borrower; or

     (g) Borrower, any Subsidiary, any general partner or joint venturer of
Borrower, or any guarantor shall die, become incompetent, dissolve, liquidate,
merge, consolidate, or cease to be in existence for any reason; or any general
partner or joint venturer of Borrower shall withdraw or notify any partner or
joint venturer of Borrower of its or his/her intention to withdraw as a partner
or joint venturer (or to become a limited partner) of Borrower; or any general
or limited partner or joint venturer of Borrower shall fail to make any
contribution required by the partnership or joint venture agreement of Borrower
as and when due under such agreement; or there shall be any change in the
partnership or joint venture agreement of Borrower from that in force on the
date hereof which may have a material adverse impact on the ability of Borrower
to repay this Note; or

     (h) any person or entity presently not in control of a corporate,
partnership or joint venture Borrower, any corporate general partner or joint
venturer of Borrower, or any guarantor, shall obtain control directly or
indirectly of Borrower, such a corporate general partner or joint venturer, or
any guarantor, whether by purchase or gift of stock or assets, by contract, or
otherwise; or

     (i) any proceeding (judicial or administrative) shall be commenced against
Borrower, any Subsidiary, any general partner or joint venturer of Borrower, or
any guarantor, or with respect to any assets of Borrower, any Subsidiary, any
general partner or joint venturer of Borrower, or any guarantor which shall
threaten to have a material and adverse effect on the assets, condition or
prospects of Borrower, any Subsidiary, any general partner or joint venturer of
Borrower, or any guarantor; or final judgment(s) and/or settlement(s) in an
aggregate amount in excess of Ten Thousand and 00/100 UNITED STATES DOLLARS
($10,000.00) in excess of insurance for which the insurer has confirmed coverage
in writing, a copy of which writing has been furnished to Lender, shall be
entered or agreed to in any suit or action commenced against Borrower, any
Subsidiary, any general partner or joint venturer of Borrower, or any guarantor;
or

     (j) Borrower shall grant or any person (other than Lender) shall obtain a
security interest in any collateral for this Note; Borrower or any other person
shall perfect (or attempt to perfect) such a security interest; a court shall
determine that Lender does not have a first-priority security interest in any of
the collateral for this Note enforceable in accordance with the terms of the
related documents; or any notice of a federal tax lien against Borrower or any
general partner or joint venturer of Borrower shall be filed with any public
recorder; or


****If this box is checked and a land trustee is signing the Note, do not take
real estate as collateral.
   3
     (k) there shall be any material loss or depreciation in the value of any
collateral for this Note for any reason, or Lender shall otherwise reasonably
deem itself insecure; or, unless expressly permitted by the related documents,
all or any part of any collateral for this Note or any direct, indirect, legal,
equitable or beneficial interest therein is assigned, transferred or sold
without Lender's prior written consent; or

     (l) any bankruptcy, insolvency, reorganization, arrangement, readjustment,
liquidation, dissolution, or similar proceeding, domestic or foreign, is
instituted by or against Borrower, any Subsidiary, any general partner or
joint venturer of Borrower, or any guarantor; or Borrower, any Subsidiary, any
general partner or joint venturer of Borrower, or any guarantor shall take any
steps toward, or to authorize, such a proceeding; or

     (m) Borrower, any Subsidiary, any general partner or joint venturer of
Borrower, or any guarantor shall become insolvent, generally shall fail or be
unable to pay its debts as they mature, shall admit in writing its inability to
pay its debts as they mature, shall make a general assignment for the benefit
of its creditors, shall enter into any composition or similar agreement, or
shall suspend the transaction of all or a substantial portion of its usual
business.

7.   DEFAULT REMEDIES.

     (a) Upon the occurrence and during the continuance of any Event of Default
specified in Section 6(a)-(k), Lender at its option may declare this Note
(principal, interest and other amounts) immediately due and payable without
notice or demand of any kind. Upon the occurrence of any Event of Default
specified in Section 6(l)-(m), this Note (principal, interest and other
amounts) shall be immediately and automatically due and payable without action
of any kind on the part of Lender. Upon the occurrence and during the
continuance of any Event of Default, Lender may exercise any rights and
remedies under this Note, any related document or instrument (including without
limitation any pertaining to collateral), and at law or in equity.

     (b) Lender may, by written notice to Borrower, at any time and from time
to time, waive any Event of Default or "Unmatured Event of Default" (as defined
below), which shall be for such period and subject to such conditions as shall
be specified in any such notice. In the case of any such waiver, Lender and
Borrower shall be restored to their former position and rights hereunder, and
any Event of Default or Unmatured Event of Default so waived shall be deemed to
be cured and not continuing; but no such waiver shall extend to or impair any
subsequent or other Event of Default or Unmatured Event of Default. No failure
to exercise, and no delay in exercising, on the part of Lender of any right,
power or privilege hereunder shall preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The rights and
remedies of Lender herein provided are cumulative and not exclusive of any
rights or remedies provided by law. "Unmatured Event of Default" means any
event or condition which would become an Event of Default with notice or the
passage of time or both.

8.   NO INTEREST OVER LEGAL RATE.

     Borrower does not intend or expect to pay, nor does Lender intend or
expect to charge, accept or collect any interest which, when added to any fee
or other charge upon the principal which may legally be treated as interest,
shall be in excess of the highest lawful rate. If acceleration, prepayment or
any other charges upon the principal or any portion thereof, or any other
circumstance, result in the computation or earning of interest in excess of the
highest lawful rate, then any and all such excess is hereby waived and shall
be applied against the remaining principal balance. Without limiting the
generality of the foregoing, and notwithstanding anything to the contrary
contained herein or otherwise, no deposit of funds shall be required in
connection herewith which will, when deducted from the principal amount
outstanding hereunder, cause the rate of interest hereunder to exceed the
highest lawful rate.

9.   PAYMENTS, ETC.

     All payments hereunder shall be made in immediately available funds, and
shall be applied first to accrued interest and then to principal; however, if
an Event of Default occurs, Lender may, in its sole discretion, and in such
order as it may choose, apply any payment to interest, principal and/or lawful
charges and expenses then accrued. Borrower shall receive immediate credit on
payments received during Lender's normal banking hours if made in cash,
immediately available funds, or by debit to available balances in an account at
Lender; otherwise payments shall be credited after clearance through normal
banking channels. Borrower authorizes Lender to charge any account of Borrower
maintained with Lender for any amounts of principal, interest, taxes, duties,
or other charges or amounts due or payable hereunder, with the amount of such
payment subject to availability of collected balances in Lender's discretion;
unless Borrower instructs otherwise, all Loans shall be credited to an
account(s) of Borrower with Lender. LENDER AT ITS OPTION MAY MAKE LOANS
HEREUNDER UPON TELEPHONIC INSTRUCTIONS AND IN SO DOING SHALL BE FULLY ENTITLED
TO RELY SOLELY UPON INSTRUCTIONS, INCLUDING WITHOUT LIMITATION INSTRUCTIONS TO
MAKE TRANSFERS TO THIRD PARTIES, REASONABLY BELIEVED BY LENDER TO HAVE BEEN
GIVEN BY AN AUTHORIZED PERSON, WITHOUT INDEPENDENT INQUIRY OF ANY TYPE. All
payments shall be made without deduction for or on account of any present or
future taxes, duties or other charges levied or imposed on this Note or the
proceeds, Lender or Borrower by any governmental or political subdivision
thereof, Borrower shall upon request of Lender pay all such taxes, duties or
other charges in addition to principal and interest, including without
limitation all documentary stamp and intangible taxes, but excluding income
taxes based solely on Lender's income.

10.  SETOFF.

     At any time and without notice of any kind, any account, deposit or other
indebtedness owing by Lender to Borrower, and any securities or other property
of Borrower delivered to or left in the possession of Lender or its nominee or
bailee, may be set off against and applied in payment of any obligation
hereunder, whether due or not.

11.  NOTICES.

     All notices, requests and demands to or upon the respective parties hereto
shall be deemed to have been given or made when deposited in the mail, postage
prepaid, addressed if to Lender to its main banking office indicated above
(Attention: Division Head, Private Banking Division), and if to Borrower to its
address set forth below, or to such other address as may be hereafter
designated in writing by the respective parties hereto or, as to Borrower, may
appear in Lender's records.

12.  MISCELLANEOUS.

     This Note and any document or instrument executed in connection herewith
shall be governed by and construed in accordance with the internal law of the
State of Illinois, and shall be deemed to have been executed in the State of
Illinois. Unless the context requires otherwise, wherever used herein the
singular shall include the plural and vice versa, and the use of one gender
shall also denote the other. Captions herein are for convenience of reference
only and shall not define or limit any of the terms or provisions hereof;
references herein to Sections or provisions without reference to the document in
which they are contained are references to this Note. This Note shall bind
Borrower, its heirs, trustees (including without limitation successor and
replacement trustees), executors, personal representatives, successors and
assigns, and shall inure to the benefit of Lender, its successors and assigns,
except that Borrower may not transfer or assign any of its rights or interest
hereunder without the prior written consent of Lender. Borrower agrees to pay
upon demand all expenses (including without limitation attorneys' fees, legal
costs and expenses, and time charges of attorneys who may be employees of
Lender, in each case whether in or out of court, in original or appellate
proceedings or in bankruptcy) incurred or paid by Lender or any holder hereof in
connection with the enforcement or preservation of its rights hereunder or under
any document or instrument executed in connection herewith. Borrower expressly
and irrevocably waives notice of dishonor or default as well as presentment,
protest, demand and notice of any kind in connection herewith. If there shall
be more than one person or entity constituting Borrower, each of them shall be
primarily, jointly and severally liable for all obligations hereunder.

13.  WAIVER OF JURY TRIAL, ETC.

     BORROWER HEREBY IRREVOCABLY AGREES THAT, SUBJECT TO LENDER'S SOLE AND
ABSOLUTE ELECTION, ALL SUITS, ACTIONS OR OTHER PROCEEDINGS WITH RESPECT TO,
ARISING OUT OF OR IN CONNECTION WITH THIS NOTE OR ANY DOCUMENT OR INSTRUMENT
EXECUTED IN CONNECTION HEREWITH SHALL BE SUBJECT TO LITIGATION IN COURTS HAVING
SITUS WITHIN OR JURISDICTION OVER COOK COUNTY, ILLINOIS. BORROWER HEREBY
CONSENTS AND SUBMITS TO THE JURISDICTION OF ANY LOCAL, STATE OR FEDERAL COURT
LOCATED IN OR HAVING JURISDICTION OVER SUCH COUNTY, AND HEREBY IRREVOCABLY
WAIVES ANY RIGHT IT MAY HAVE TO REQUEST OR DEMAND TRIAL BY JURY, TO TRANSFER OR
CHANGE THE VENUE OF ANY SUIT, ACTION OR OTHER PROCEEDING BROUGHT BY LENDER IN
ACCORDANCE WITH THIS PARAGRAPH, OR TO CLAIM THAT ANY SUCH PROCEEDING HAS BEEN
BROUGHT IN AN INCONVENIENT FORUM.

[X]  See Rider attached hereto and incorporated herein by reference.

     Lender is hereby authorized by Borrower without notice to Borrower to fill
in any blank spaces and dates and strike inapplicable terms herein or in any
related document to conform to the terms upon which the Loan(s) evidenced
hereby are or may be made, for which purpose Lender shall be deemed to have
been granted an irrevocable power of attorney coupled with an interest.


                                        Address for Notices:

                                        2600 Cross Park Road
                                        ----------------------------------------

Neural Applications Corporation         Coralville, IA 52241
- ------------------------------------    ----------------------------------------

By: /s/ Robert B. Staib
    --------------------------------    ----------------------------------------
    Robert B. Staib

Title: Chairman and CEO                 Attention:
       -----------------------------               -----------------------------
   4
                                    RIDER TO
                            MASTER NOTE (FORM 9601)

DATED AS OF November 28, 1997 EXECUTED BY Neural Applications Corporation
            -----------  ----             -------------------------------
(the "Borrower") IN FAVOR OF THE NORTHERN TRUST COMPANY (the "Lender")

                           (COMMITTED LINE OF CREDIT)

     1. This Rider is attached to and forms and integral part of the above-
referenced Master Note (as amended, the "Note"). Capitalized terms defined in
the remainder of the Note and not otherwise defined in this Rider shall have the
same meaning in this Rider as in the remainder of the Note. Wherever possible
this Rider and the remainder of the Note shall be construed so as to be
consistent with each other; however, if and to the extent that the terms of this
Rider conflict or are inconsistent with the remainder of the Note, the terms of
this Rider shall prevail. Except as modified by this Rider the terms of the
remainder of the Note shall apply.

     2. The first paragraph of Section 3 ("LINE OF CREDIT") is deleted and the
following is substituted.


       "COMMITTED LINE OF CREDIT:   This Note has been executed pursuant to a
       committed line of credit. By its acceptance of this Rider to this Note,
       Lender shall be deemed to have agreed to make available to Borrower Loans
       as outlined herein or in any related letter until the maturity date
       indicated above unless and until any 'Event of Default' (as defined
       below) occurs, in which case Lender shall have no obligation whatsoever
       to make any Loan hereunder or otherwise to extend credit to Borrower.
       Lender shall have no obligation to give Borrower or any other person or
       entity prior notice of the existence of any Event of Default or of any
       decision not to make any Loan or otherwise extend credit to Borrower."

     Dated as of November 28, 1997.
                 ----------   ----

                                      ------------------------------------------
                                      Type Name
                                               ---------------------------------
                                      Neural Applications Corporation
                                      ------------------------------------------
                                      By: /s/ Robert B. Staib
                                         ---------------------------------------
                                              Robert B. Staib
                                      Title: Chairman and CEO
                                            ------------------------------------