1

                                 EXHIBIT 10 (qq)
                       REVOLVING NOTE BETWEEN THE COMPANY
                           AND LASALLE NATINOAL BANK
                              DATED JUNE 28, 1998

                                       1
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                           REPLACEMENT REVOLVING NOTE

$25,000,000                                           Dated as of June 28, 1998
                                                            Due:  June 28, 1999


On or before June 28, 1999, CDW COMPUTER CENTERS, INC. (the "Undersigned"),  for
value  received,  promises  to pay to the  order of  LASALLE  NATIONAL  BANK,  a
national  banking  association  (hereinafter,  together with any holder thereof,
called "Bank"), whose address is 135 S. LaSalle Street, Chicago, Illinois 60603,
the principal sum of Twenty Five Million and 00/100 Dollars  ($25,000,000) or if
less, the aggregate unpaid principal amount of all loans made by the Bank to the
Undersigned  hereunder (this "Note").  The unpaid  principal amount hereof shall
bear interest at the Undersigned's option of the following:


     (i) a fixed rate equal to the greater of (A) the "Prime Rate"  (hereinafter
defined) minus two and one-half percent (-2 1/2%) per annum, or (B) the "Federal
Funds Rate"  (hereinafter  defined)  plus  one-half  of one percent  (+1/2%) per
annum,  for borrowings not to exceed thirty (30) days,  such rate to be fixed at
the beginning of the term of such borrowing (the "Fixed Prime Rate"); or

     (ii) a floating  rate equal to the  greater of (A) the Prime Rate minus two
and  one-half  percent (-2 1/2%) per annum,  or (B) the Federal  Funds Rate plus
one-half of one percent  (+1/2%) per annum,  for  borrowings in excess of thirty
(30) days (the  "Floating  Prime Rate");  the Floating  Prime Rate and the Fixed
Prime Rate are referred to herein collectively as the "Prime Rate"); or

     (iii) "Adjusted LIBOR" (hereinafter defined).

1. For purposes hereof the following terms shall have the following definitions:

     "Prime  Rate" shall mean the rate in effect from time to time as set by the
Bank and called its Prime Rate.  The effective  date of any change in said Prime
Rate shall for purposes  hereof be the date the rate is changed by the Bank. The
Bank shall not be obligated to give notice of any change in the Prime Rate.

     "Federal Funds Rate" shall mean, for any day, the daily  effective  Federal
Funds rate for such day as published in the Federal Reserve  Statistical Release
H.15("H.15")  (or, if such Release is not  published,  the successor  thereto or
closest approximation thereto, as determined by the Bank) for such day; provided
that,  the Federal  Funds Rate for any day on which the Federal  Reserve Bank of
New York,  (the "New York Fed") is not open for  business  shall be the  Federal
Funds  Rate for the next  preceding  day on which  the New York Fed was open for
business;  and provided,  further,  that if the Bank determines,  in good faith,
that it is unable to determine the Federal Funds Rate on the basis of H.15, then
the Bank shall determine the Federal Funds Rate based on the quotations of three
(3) dealers in Federal  Funds in New York City,  as  reasonably  selected by the
Bank, and the Bank's  determination of such rate shall be binding and conclusive
absent manifest error.

     "Adjusted  LIBOR" means a rate of interest equal to one-half of one percent
(1/2%)  per  annum in excess of the per annum  rate of  interest  at which  U.S.
dollar  deposits in an amount  comparable  to the amount of the relevant  "LIBOR
Loan"  (hereinafter  defined) and for a period  equal to the relevant  "Interest
Period" (hereinafter defined) are offered generally to the Bank (rounded upward,
if necessary,  to the nearest 1/16 of 1.00%) in the London Interbank  Eurodollar
market  at  11:00  a.m.  (London  time)  two  (2)  banking  days  prior  to  the
commencement  of each  Interest  Period,  such  rate to  remain  fixed  for such
Interest Period.

     "Interest Period" shall mean successive one, two or three-month  periods as
selected  from time to time by the  Undersigned  by notice given to the Bank not
less than  three (3)  business  days  prior to the first day of each  respective
Interest  Period;  provided that:  (i) each such one, two or three-month  period
occurring  after such initial period shall commence on the day on which the next
preceding period expires;  (ii) the final Interest Period shall be such that its
expiration  occurs on or before the stated  maturity date of the Note; and (iii)
if for any reason the Undersigned shall fail to select timely a period,  then it
shall be deemed to have  selected  a LIBOR  Loan  with a




one(1) month Interest  Period;  provided  that, at any time any Interest  Period
expires less than one (1) month before the maturity of the Note,  then,  for the
period  commencing on such  expiration date and ending on the maturity date such
LIBOR Loan shall convert to a loan bearing interest at the Floating Prime Rate.

     2.  Interest on that portion of the  outstanding  principal  amount  hereof
bearing interest at the Prime Rate shall be payable from the date hereof on such
aggregate unpaid  principal amount on the last day of each month,  commencing on
July 31, 1998, and at maturity  hereof.  Interest on LIBOR  borrowings  shall be
payable at the end of each respective  Interest Period.  Interest after maturity
(whether by reason of  acceleration  or  otherwise)  shall be paid on the unpaid
balance at the rate of the  Floating  Prime Rate plus two percent (2%) per annum
(the  "Default  Rate").  Interest  shall  be  computed  on the  basis  of a year
consisting  of 360 days and shall be paid for the actual number of days elapsed,
unless otherwise specified herein.

     3. Each  LIBOR  borrowing  hereunder  (each,  a "LIBOR  Loan")  must  equal
$100,000 or an integral multiple  thereof.  Interest on each LIBOR Loan shall be
payable on the last banking day of each  Interest  Period with respect  thereto,
commencing  on the first such date to occur after the date hereof,  at maturity,
after  maturity on demand,  and on the date of any payment  hereon on the amount
paid. The Undersigned  hereby further  promises to pay to the order of the Bank,
on demand,  interest  on the  unpaid  principal  amount  hereof  after  maturity
(whether by acceleration or otherwise) at the Default Rate.

     4. Provisions  applicable to LIBOR Loans:  (a) The Bank's  determination of
Adjusted  LIBOR as provided above shall be conclusive,  absent  manifest  error.
Furthermore, if the Bank determines, in good faith (which determination shall be
conclusive,  absent manifest  error),  prior to the commencement of any Interest
Period that (a) U.S.  dollar  deposits of  sufficient  amount and  maturity  for
funding  any LIBOR Loan are not  available  to the Bank in the London  Interbank
Eurodollar  market  in the  ordinary  course  of  business,  or (b) by reason of
circumstances  affecting the London Interbank  Eurodollar  market,  adequate and
fair means do not exist for  ascertaining  the rate of interest to be applicable
to the relevant LIBOR Loan, the Bank shall promptly  notify the  Undersigned and
such LIBOR Loan shall automatically  convert on the last day of its then-current
Interest Period to a loan bearing interest at the Floating Prime Rate.

     (b) If, after the date hereof,  the  introduction  of, or any change in any
applicable law, treaty,  rule,  regulation or guideline or in the interpretation
or administration  thereof by any governmental  authority or any central bank or
other fiscal,  monetary or other authority having  jurisdiction over the Bank or
its lending office (a "Regulatory Change"),  shall, in the opinion of counsel to
the Bank,  makes it  unlawful  for the Bank to make or  maintain  any LIBOR Loan
evidenced  hereby,  then the Bank shall promptly notify the Undersigned and such
LIBOR  Loan  shall  automatically  convert  on the last day of its  then-current
Interest Period to a loan bearing interest at the Floating Prime Rate.

     (c) If, for any reason,  any LIBOR Loan is paid prior to the last  business
day of its then-current Interest Period, the Undersigned agrees to indemnify the
Bank against any loss  (including any loss on redeployment of the funds repaid),
cost or expense incurred by the Bank as a result of such prepayment.

     (d) If any Regulatory Change (whether or not having the force of law) shall
(a) impose, modify or deem applicable any assessment,  reserve,  special deposit
or similar requirement against assets held by, or deposits in or for the account
of or loans by, or any other acquisition of funds or disbursements by, the Bank;
(b) subject the Bank or any LIBOR Loan to any tax,  duty,  charge,  stamp tax or
fee or change the basis of  taxation of  payments  to the Bank of  principal  or
interest due from the Undersigned to the Bank hereunder  (other than a change in
taxation of the  overall net income of the Bank);  or (c) impose on the Bank any
other condition regarding such LIBOR Loan or the Bank's funding thereof, and the
Bank shall determine (which  determination shall be conclusive,  absent manifest
error) that the result of the  foregoing  is to increase the cost to the Bank of
making or  maintaining  such LIBOR Loan or to reduce the amount of  principal or
interest  received by the Bank hereunder,  then the Undersigned shall pay to the
Bank, on demand and presentation of satisfactory  documentation  therefor,  such
additional  amounts  as the  Bank  shall,  from  time  to  time,  determine  are
sufficient to  compensate  and  indemnify  the Bank for such  increased  cost or
reduced amount.



     5. The Undersigned  hereby authorizes the Bank to charge any account of the
Undersigned for all sums due hereunder.  Principal  payments  submitted in funds
not available until  collected shall continue to bear interest until  collected.
If payment  hereunder  becomes due and  payable on a  Saturday,  Sunday or legal
holiday  under the laws of the United  States or the State of Illinois,  the due
date thereof shall be extended to the next succeeding business day, and interest
shall be payable thereon at the rate specified during such extension.

     6.  This  Note  evidences  a  revolving  line of  credit  under  which  the
Undersigned is indebted to the Bank and evidences the aggregate unpaid principal
amount of all advances made or to be made by the Bank to the  Undersigned  under
the Note. All advances and repayments hereunder shall be evidenced by entries on
the books and  records of the Bank which  shall be  presumptive  evidence of the
principal  amount and interest  owing and unpaid on this Note, or any renewal or
extension  hereof.  The  failure  to so record  any such  amount or any error so
recording  any such amount shall not,  however,  limit or  otherwise  affect the
obligations of the Undersigned hereunder or under any not to repay the principal
amount of the liabilities together with all interest accruing thereon. This Note
may be used for direct  advances  or letters  of credit.  Each  letter of credit
requested by the Undersigned shall be subject to the terms and conditions of the
Bank's standard letter of credit application,  which application is incorporated
herein by this reference.  The amount  available to the  Undersigned  under this
Note  shall be reduced by the face  amount of all  letters of credit  issued and
outstanding  hereunder.  All letters of credit  issued  hereunder  shall have an
expiry date no later than June 28, 2000. The Undersigned and the Bank agree that
each draw under any letter of credit shall constitute, and shall be repaid by, a
direct  advance under this Note on the date of such draw.  Each letter of credit
requested by the  Undersigned  hereunder  shall be issued by the Bank only after
the Bank has  received  a fully  executed  letter of credit  application  on the
Bank's  standard form and the Bank's  customary  fees for issuance of letters of
credit.

     7.  Advances  under  this  Note  may be made by the Bank  upon the  written
request of any two (2) authorized officers of the Undersigned whose authority to
so act has not been revoked by the Undersigned in writing  theretofore  received
by the Bank at its main office. Any such advances shall be conclusively presumed
to have  been made by the Bank to or for the  benefit  of the  Undersigned.  The
Undersigned  does  hereby  irrevocably  confirm,  ratify  and  approve  all such
advances  by the Bank and  does  hereby  indemnify  the  Bank  against  loss and
reasonable expenses (including court costs, attorneys' and paralegals' fees) and
shall hold the Bank harmless with respect thereto.

     8. The Undersigned shall be in default hereunder if: (a) any amount payable
on this and any and all other  liabilities or obligations of the  Undersigned to
the Bank,  howsoever  created,  arising or  evidenced,  whether now  existing or
hereafter arising,  whether now due or to become due, whether direct,  indirect,
absolute,  contingent, joint, several or joint and several (all such liabilities
and  obligations,  including  this  Note,  are  hereinafter  referred  to as the
"Obligations")  or on the  obligations  of any  obligor  hereunder,  it not paid
within five (5) days of when due; or (b) the Undersigned shall otherwise fail to
perform any of the  promises to be  performed  by the  Undersigned  hereunder or
under any other security agreement or other agreement with the Bank and the same
is not cured within  thirty (30) days of notice  thereof by the Bank; or (c) the
Undersigned,  or any other party liable with respect to the Obligations,  or any
guarantor  or  accommodation  endorser  or third party  pledgor,  shall make any
assignment  for the  benefit  of  creditors,  or there  shall be  commenced  any
bankruptcy, receivership, insolvency, reorganization, dissolution or liquidation
proceedings  by or  against,  or the entry of any  judgment,  levy,  attachment,
garnishment  or  other  process  (except  for any  judgment,  levy,  attachment,
garnishment or other process entered pursuant to certain  litigation  instituted
by John Marks,  as  described  in the  Undersigned's  1998 proxy  statement,  as
amended from time to time), or the filing of any lien against the Undersigned or
any  guarantor,  or any other party liable with respect to the  Obligations,  or
accommodation  endorser or third party pledgor for any of the Obligations  which
has a material  adverse effect on such party;  or (d) the  determination  by the
Bank that a material  adverse change has occurred in the financial  condition of
the  Undersigned  from the  condition  set  forth in the most  recent  financial
statement  of the  Undersigned  furnished  to the  Bank,  or from the  financial
condition of the Undersigned  most recently  disclosed to the Bank in any manner
and the same is not cured within thirty (30) days of notice thereof by the Bank;
or (e) any oral or written warranty, representation, certificate or statement of
the Undersigned to the Bank is untrue in any material respect; or (f) failure of
the Undersigned, within thirty (30) days after a request by the Bank, to furnish
financial  information or to permit  inspection by the Bank of the Undersigned's
books and records;  or (g) the  occurrence  of any material  adverse



event which causes a change in the financial  condition of the  Undersigned,  or
which would have a material  adverse  effect on the business of the  Undersigned
and the same is not cured  within  thirty (30) days notice  thereof by the Bank;
provided,  that any event relating to the John Marks  litigation as set forth in
subsection (3) above shall not be deemed to violate this  subsection (g); or (h)
the  Undersigned  fails to have, at the end of each of its fiscal quarters (1) a
Tangible Net Worth of at least  $100,000,000,  or (2) a ratio of  Liabilities to
Tangible Net Worth of no greater than 2.0:1.0 and a default of either (1) or (2)
shall not be cured by the Undersigned within thirty (30) days.

     9.  For  purposes  hereof,  "Tangible  Net  Worth"  shall  mean  the sum of
shareholders' equity plus debt subordinated to the Undersigned's  liabilities to
the Bank, minus intangibles,  including, but not limited to, goodwill,  customer
lists,  prepaid  items,  deferred  charges,  debts  owed by  officers  and other
affiliates and such "Other  Assets" as set forth on the financial  statements of
the  Undersigned.  "Liabilities"  shall mean all  liabilities of the Undersigned
that would be shown on a balance sheet of the Undersigned prepared in accordance
with generally accepted accounting principles consistently applied.

     10.  Whenever the  Undersigned  shall be in default as  aforesaid,  without
demand or notice of any kind  except as set  forth  herein,  the  entire  unpaid
amount of all Obligations shall become immediately due and payable, and the Bank
may exercise, from time to time, any and all rights and remedies available to it
under the Uniform  Commercial  Code of Illinois,  or otherwise,  including those
available  under any written  instrument  (in addition to this Note) relating to
any of  the  Obligations  and  may,  without  demand  or  notice  of  any  kind,
appropriate  and apply  toward the payment of such of the  Obligations,  whether
matured or unmatured,  including  reasonable  costs of collection and reasonable
attorneys'  and  paralegals'  fees, and in such order of application as the Bank
may, from time to time,  elect,  any balances,  credits,  deposits,  accounts or
monies of the Undersigned in possession, control or custody of, or in transit to
the Bank.

     11.  THE  UNDERSIGNED  WAIVES THE  BENEFIT OF ANY LAW THAT WOULD  OTHERWISE
RESTRICT  OR LIMIT  THE BANK IN THE  EXERCISE  OF ITS  RIGHTS,  WHICH IS  HEREBY
ACKNOWLEDGED,  TO  APPROPRIATE  WITHOUT  NOTICE,  AT  ANY  TIME  HEREAFTER,  ANY
INDEBTEDNESS MATURED OR UNMATURED,  OWING FROM THE BANK TO THE UNDERSIGNED.  THE
BANK MAY, FROM TIME TO TIME,  WITHOUT DEMAND OR NOTICE OF ANY KIND,  APPROPRIATE
AND APPLY  TOWARD THE PAYMENT OF SUCH OF THE  OBLIGATIONS,  AND IN SUCH ORDER OF
APPLICATION,  AS THE  BANK  MAY,  FROM  TIME TO  TIME,  ELECT  ANY AND ALL  SUCH
BALANCES, CREDITS, DEPOSITS, ACCOUNTS, MONIES, CASH EQUIVALENTS AND OTHER ASSETS
OF OR IN THE NAME OF THE  UNDERSIGNED,  THEN OR  THEREAFTER  WITH THE BANK.  THE
UNDERSIGNED  DOES  HEREBY  ASSIGN  AND  TRANSFER  TO THE BANK ANY AND ALL  CASH,
NEGOTIABLE   INSTRUMENTS,   DOCUMENTS  OF  TITLE,  CHATTEL  PAPER,   SECURITIES,
CERTIFICATES  OF DEPOSIT,  DEPOSIT  ACCOUNTS,  OTHER CASH  EQUIVALENTS AND OTHER
ASSETS OF THE  UNDERSIGNED  IN THE  POSSESSION  OR  CONTROL  OF THE BANK FOR ANY
PURPOSE.

     12. THE UNDERSIGNED WAIVES EVERY DEFENSE, CAUSE OF ACTION,  COUNTERCLAIM OR
SET OFF WHICH THE  UNDERSIGNED  MAY NOT HAVE OR HEREAFTER MAY HAVE TO ANY ACTION
BY BANK IN  ENFORCING  THIS NOTE OR ANY OF THE OTHER  OBLIGATIONS,  RATIFIES AND
CONFIRMS  WHATEVER  THE BANK MAY DO PURSUANT TO THE TERMS HEREOF AND AGREES THAT
BANK SHALL NOT BE LIABLE FOR ANY ERROR OF  JUDGMENT  OR  MISTAKES OF FACT OR LAW
EXCEPT  FOR  THOSE  ERRORS  OR  MISTAKES  WHICH  RESULT  FROM THE  BANK'S  GROSS
NEGLIGENCE  OR  WILLFUL  MISCONDUCT.  THE BANK AND THE  UNDERSIGNED,  KNOWINGLY,
VOLUNTARILY  AND  INTENTIONALLY  WAIVE  IRREVOCABLY THE RIGHT EITHER MAY HAVE TO
TRIAL BY JURY WITH RESPECT TO ANY LEGAL PROCEEDING BASED HEREON,  OR ARISING OUT
OF, UNDER OR IN CONNECTION  WITH THIS NOTE OR ANY OF THE OTHER  OBLIGATIONS,  OR
ANY AGREEMENT,  EXECUTED OR CONTEMPLATED TO BE EXECUTED IN CONJUNCTION  HEREWITH
OR ANY  COURSE  OF  CONDUCT  OR  COURSE  OF  DEALING  IN WHICH  THE BANK AND THE
UNDERSIGNED ARE ADVERSE PARTIES. THIS



PROVISION  IS  A  MATERIAL  INDUCEMENT  FOR  THE  BANK  GRANTING  ANY  FINANCIAL
ACCOMMODATION TO THE UNDERSIGNED.

     13.  The  Undersigned,  and any other  party  liable  with  respect  to the
Obligations,   including  any   guarantors,   and  any  and  all  endorsers  and
accommodation  parties,  and each one of them,  waive  any and all  presentment,
demand,  notice of  dishonor,  protest,  and all other  notices  and  demands in
connection  with the  enforcement  of the  Bank's  right  hereunder,  and hereby
consent to, and waive notice of release, with or without  consideration,  of the
Undersigned.  No default shall be waived by the Bank except in writing. No delay
on the part of the Bank in the exercise of any right or remedy shall  operate as
a waiver thereof,  and no single or partial exercise by the Bank of any right or
remedy shall preclude other or further exercise thereof,  or the exercise of any
other  right or remedy.  This Note:  (I) is valid,  binding and  enforceable  in
accordance  with  its  provisions,   and  no  conditions   exist  to  the  legal
effectiveness  of this Note;  (ii)  contains  the entire  agreement  between the
Undersigned and the Bank; (iii) is the final expression of the intentions of the
Undersigned and the Bank; and (iv) supersedes all negotiations, representations,
warranties, commitments, offers, contracts (of any kind or nature, whether or al
or written) prior to or  contemporaneous  with the execution hereof. No prior or
contemporaneous representation, warranties, understandings, offers or agreements
of any kind or nature,  whether  oral or written,  have been made by the Bank or
relied upon by the  Undersigned  in  connection  with the execution  hereof.  No
modification,  discharge,  termination or waiver of any of the provisions hereof
shall be binding upon the Bank,  except as expressly set forth in a writing duly
signed and delivered on behalf of the Bank.

     14. The  Undersigned  agrees to pay all reasonable  costs,  legal expenses,
attorneys fees and paralegals'  fees of every kind, paid or incurred by the Bank
in enforcing its rights hereunder,  including, but not limited to, litigation or
proceedings  initiated under the United States Bankruptcy Code, or in respect to
any other of the  Obligations,  or in defending  against any  defense,  cause of
action,  counterclaim,  set off or crossclaim  based on any act of commission or
omission by the Bank with respect to this Note or any other of the  Obligations,
promptly on demand of the Bank or other person paying or incurring the same.

     15.  TO  INDUCE  THE BANK TO MAKE  THE LOAN  EVIDENCED  BY THIS  NOTE,  THE
UNDERSIGNED  IRREVOCABLY  AGREES THAT ALL ACTIONS ARISING DIRECTLY OR INDIRECTLY
AS A RESULT OR IN CONSEQUENCE OF THIS NOTE OR ANY OTHER  AGREEMENT WITH THE BANK
SHALL BE  INSTITUTED  AND  LITIGATED  ONLY IN COURTS HAVING SITUS IN THE CITY OF
CHICAGO,  ILLINOIS,  AND  THE  UNDERSIGNED  HEREBY  CONSENTS  TO  THE  EXCLUSIVE
JURISDICTION  AND VENUE OF ANY STATE OR  FEDERAL  COURT  LOCATED  AND HAVING ITS
SITUS IN SAID CITY, AND WAIVES ANY OBJECTION BASED ON FORUM NON CONVENIENS.  THE
UNDERSIGNED HEREBY WAIVES PERSONAL SERVICE OF ANY AND ALL PROCESS,  AND CONSENTS
THAT ALL SUCH SERVICE OF PROCESS MAY BE MADE BY CERTIFIED  MAIL,  RETURN RECEIPT
REQUESTED,  DIRECTED TO THE  UNDERSIGNED AT THE ADDRESS  INDICATED IN THE BANK'S
RECORDS IN THE MANNER  PROVIDED BY  APPLICABLE  STATUTE,  LAW,  RULE OF COURT OF
OTHERWISE.

     16.  The  loan  evidenced  hereby  has been  made  and  this  Note has been
delivered at the Bank's main office.  This Note shall be governed and  construed
in accordance with the laws of the State of Illinois, in which state it shall be
performed,  and shall be binding upon the  Undersigned  and its  successors  and
assigns. If this Note contains any blanks when executed by the Undersigned,  the
Bank is hereby  authorized,  without notice to the Undersigned,  to complete any
such blanks  according  to the terms upon which the loan or loans were  granted.
Wherever  possible,  each  provision of this Note shall be  interpreted  in such
manner as to be effective and valid under  applicable  law, but if any provision
of this Note shall be prohibited by or be invalid under such law, such provision
shall be severable,  and be deemed ineffective to the extent of such prohibition
or invalidity  without  invalidating  the remaining  provisions of this Note. If
more than one party shall  execute  this Note,  the term  "Undersigned"  as used
herein shall mean all parties signing this Note and their respective  successors
and  assigns,  and  such  parties  shall,  as the case may be,  be  jointly  and
severally obligated hereunder.



     17. The Undersigned  represents and warrants to the Bank that the execution
and delivery of this Note has been duly  authorized  by  resolutions  heretofore
adopted by its Board of  Directors  and in  accordance  with law and its bylaws,
that said resolutions have not been amended or rescinded,  are in full force and
effect and that the officer or officers  executing and delivering  this Note for
and on behalf of the  Undersigned  are duly  authorized  so to act. The Bank, in
extending financial  accommodations to the Undersigned,  is expressly acting and
relying upon the aforesaid representations and warranties.

     18. The Undersigned  acknowledges and agrees that the lending  relationship
hereby  created  with the Bank is and has been  conducted  on an open and  arm's
length basis in which no fiduciary  relationship  exits and that the Undersigned
has  not  relied  and is not  relying  on any  such  fiduciary  relationship  in
consummating the loan evidenced by this Note.

     19.  This Note is secured by an  Assignment/Acceptance  Agreement  from the
Undersigned  relating to a Federal Home Loan Bank Discount Note with a par value
of $1,100,000.

     20. As used herein,  all provisions shall include the masculine,  feminine,
neuter, singular and plural thereof, wherever the context and facts require such
construction and in particular the word "Undersigned" shall be so construed.

     21. This Note is in replacement and  substitution  for, but not a repayment
of, that certain $15,000,000  Revolving Note dated as of December 9, 1997 of the
Undersigned  payable  to the  order of the Bank  and does not and  shall  not be
deemed to constitute a novation therefor.

IN WITNESS WHEREOF, the Undersigned has executed this Note on the date above set
forth.

                                 CDW COMPUTER CENTERS, INC.


                                 By:        _______________________________
                                 Name:      Michael P. Krasny
                                 Title:     Chairman & Chief Executive Officer


                                 By:        _______________________________
                                 Name:      Harry J. Harczak, Jr.
                                 Title:     Chief Financial Officer



87763-1