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Pamela Roberts
April 24, 2000

Page 3

                                 EXHIBIT (b) (2)

                            Interactive Systems, Inc.

                             1777 North Kent Street

                               Arlington, VA 22209

                                 April 24, 2000

By Courier

Pamela Roberts
Sandy Spring National Bank
17801 Georgia Avenue
Olney, Maryland 20832

         Re:   Consent regarding various provisions of the Amended and Restated

             Loan and Security Agreement between Interactive Systems, Inc. and

                  Sandy Spring National

                  Bank

Dear Ms. Roberts:

         The purpose of this letter is to request  your  consent  under  certain
provisions  of  the  Amended  and  Restated  Loan  Agreement   entered  into  by
Interactive Systems, Inc. ("ISI") and Sandy Spring National Bank (the "Bank") on
March 30, 2000 (the "Agreement"), to a tender offer, which ISI will undertake in
order to acquire control of CSI Computer Specialists, Inc. ("CSI")

Plans of ISI:

         ISI hereby  advises the Bank that it  anticipates  commencing  a tender
offer for all of the  outstanding  common stock of CSI not already  owned by Mr.
Donald C. Weymer,  ISI's  founder,  Chief  Executive  Officer,  Director and 98%
shareholder, in April 2000 (the "Offer"). The Offer is intended to enable ISI to
acquire  control of, and the entire equity  interest in CSI. Upon  completion of
the Offer, ISI intends to operate CSI as a majority-owned subsidiary of ISI.

         If the CSI  stockholders  do not tender all of their common stock,  ISI
intends to evaluate  whether,  under the circumstances at that time, it would be
in the best interest of ISI and CSI to acquire  additional common stock by means
of a second tender offer, merger or other transaction.

         ISI  expects to use a portion of the funds from the  revolving  line of
credit under the Agreement to purchase the common stock.

Related Provisions in the Agreement:

1)       Section 2.02. Manner of Borrowing and Disbursement of Revolving Loan.

         Section 2.02 of the Agreement  provides that,  before each disbursement
         under the line of credit, ISI is required to submit to the Bank for its
         approval  a written  statement  of the  purpose  of such  disbursement,
         together with a contemplated source of repayment of the disbursement.

         Under  Section  2.02  of  the  Agreement,  ISI  hereby  requests  up to
         $1,100,000  for the  purpose  of  purchasing  the  common  stock of CSI
         Computer  Services,  Inc. through the transaction  described above. ISI
         intends to repay the funds  borrowed for the Offer from the  collection
         of receivables.

2) Section 7.03. Merger, Sale of Assets, Etc.

         Section 7.03 of the Agreement  provides that ISI must obtain the Bank's
         written  consent  in order to enter  into or be a party to a merger  or
         consolidation, or purchase or otherwise acquire any shares of stock of,
         or similar interest in any other person.

         Under  Section 7.03 of the  Agreement,  ISI hereby  requests the Bank's
         consent regarding the transactions described above;  specifically,  the
         purchase of common stock of CSI through the Offer and, if necessary,  a
         second tender offer, merger or other consolidation with CSI.

3)       Section 7.07. Subsidiaries.

         Section 7.07 of the Agreement provides that ISI may not form or acquire
         any subsidiaries without the prior written consent of the Bank.

         Under  Section 7.07 of the  Agreement,  ISI hereby  requests the Bank's
         consent to acquire and operate CSI as a majority-owned subsidiary.

         If you have any questions about this Consent  Letter,  please feel free
to call Robert V. Windley at (703) 247-1223, or our counsel, Jeffrey B. Grill at
(202) 663-9201. If you do not have any questions,  please sign this letter below
evidencing  your consent  under the  Agreement to the  proposed  actions  listed
herein and return the original of this consent  letter as soon as possible.  The
enclosed copy is for your records.

Sincerely,

/s/ Donald C. Weymer

Donald C. Weymer






THE BANK CONSENTS TO ALL OF THE ACTIONS  PROPOSED IN THIS CONSENT LETTER FOR THE
PURPOSES OF THE LOAN AND SECURITY AGREEMENT:

SANDY SPRING NATIONAL BANK

By:      /s/ Pamela Roberts

         Pamela Roberts

Date:    April 24, 2000