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                                                                  EXHIBIT (a)(5)

                           Offer to Purchase for Cash

                     All Outstanding Shares of Common Stock

                                       of

                         CSI Computer Specialists, Inc.

                                       at

                               $1.00 Net Per Share

                                       by

                            Interactive Systems, Inc.


               -----------------------------------------------------------------
               THE OFFER AND WITHDRAWAL RIGHTS WILL EXPIRE AT 5:00 P.M., EASTERN
               TIME, ON TUESDAY, MAY 23, 2000, UNLESS THE OFFER IS EXTENDED

- -------------------------------------------------------------------------------

To Our Clients:

     Enclosed for your consideration are the Offer to Purchase,  dated April 26,
2000 (the "Offer to  Purchase"),  and the  related  letter of  transmittal  (the
"Letter of Transmittal,"  which together with the Offer to Purchase,  as amended
or supplemented from time to time, collectively constitute the "Offer") relating
to  the  offer  by  Interactive  Systems,  Inc.,  a  Virginia  corporation  (the
"Purchaser"),  to purchase all  outstanding  shares of Common  Stock,  par value
$0.001 per share (the "Common  Shares"),  of CSI Computer  Specialists,  Inc., a
Delaware  corporation (the  "Company"),  at a purchase price of $1.00 per Common
Share, net to the seller in cash (less any required withholding taxes),  without
interest thereon,  upon the terms and subject to the conditions set forth in the
Offer.  Holders of Common Shares whose  certificates for such Common Shares (the
"Share Certificates") are not immediately available, or who cannot deliver their
Share  Certificates  and all  other  required  documents  to  Continental  Stock
Transfer & Trust Company (the  "Depositary")  on or prior to the Expiration Date
(as defined in the Offer to Purchase), or who cannot complete the procedures for
book-entry transfer on a timely basis, must tender their Common Shares according
to the  guaranteed  delivery  procedures  set forth in Section 3 of the Offer to
Purchase.

     WE ARE THE HOLDER OF RECORD OF COMMON SHARES HELD BY US FOR YOUR ACCOUNT. A
TENDER OF SUCH COMMON  SHARES CAN BE MADE ONLY BY US AS THE HOLDER OF RECORD AND
PURSUANT TO YOUR INSTRUCTIONS. THE LETTER OF TRANSMITTAL IS FURNISHED TO YOU FOR
YOUR  INFORMATION ONLY AND CANNOT BE USED BY YOU TO TENDER COMMON SHARES HELD BY
US FOR YOUR ACCOUNT.

     Accordingly,  we request  instructions  as to  whether  you wish to have us
tender on your  behalf  any or all  Common  Shares  held by us for your  account
pursuant to the terms and conditions set forth in the Offer.

     Please note the following:

1.       The tender price is $1.00 per Common Share, net to you in cash, without
         interest  thereon,  upon the terms and  subject to the  conditions  set
         forth in the Offer.

2.       The Offer is being made for all  outstanding  Common Shares not already
         owned by Donald C. Weymer,  the  Purchaser's  founder,  Chief Executive
         Officer, President, a Director and 98% shareholder.

3.       The Board of Directors of the Company has determined that, based on the
         Company's  current  financial   condition,   its  inability  to  obtain
         financing for its  operations,  recent bid prices for the Common Shares
         on the OTC Bulletin  Board and the  Company's  current book value,  the
         Offer is in the best interests of the Company and its  stockholders and
         has voted to recommend to the Company  stockholders  acceptance  of the
         Offer.  The  Board of  Directors  of the  Company  recommends  that the
         Company's  stockholders  tender  their  Common  Shares  pursuant to the
         Offer.

4.       The Offer is subject to certain customary closing  conditions set forth
         in the Offer to Purchase. See Section 10, "Conditions of the Offer," of
         the Offer to Purchase.

5.       Any stock transfer taxes applicable to the sale of Common Shares to the
         Purchaser  pursuant to the Offer will be paid by the Purchaser,  except
         as otherwise provided in Instruction 6 of the Letter of Transmittal.

6.       The Offer and withdrawal rights will expire at 5:00 P.M., Eastern Time,
         on Tuesday, May 23, 2000, unless the Offer is extended.

               7. Payment for Common Shares purchased pursuant to the Offer will
               in all cases be made only after timely  receipt by the Depositary
               of  (a)  Share   Certificates  or  timely   confirmation  of  the
               book-entry  transfer  of such  Common  Shares  into  the  account
               maintained by the  Depositary at The  Depository  Trust  Company,
               pursuant to the  procedures  set forth in Section 3,  "Procedures
               for Accepting  the Offer and  Tendering  Shares," of the Offer to
               Purchase, (b) the Letter of Transmittal (or a facsimile thereof),
               properly completed and duly executed, with any required signature
               guarantees  or an  Agent's  Message  (as  defined in the Offer to
               Purchase),  in connection with a book-entry delivery, and (c) any
               other   documents   required   by  the  Letter  of   Transmittal.
               Accordingly,   payment   may  not  be   made  to  all   tendering
               stockholders  at  the  same  time,   depending  upon  when  Share
               Certificates  or  confirmations  of  book-entry  transfer of such
               Common  Shares  into the  Depositary's  account  at a  Book-Entry
               Transfer Facility are actually received by the Depositary.

     If you wish to have us tender  any or all of the Common  Shares  held by us
for your account, please so instruct us by completing,  executing, detaching and
returning to us the instruction  form set forth on the last page of this letter.
If you authorize the tender of your Common  Shares,  all such Common Shares will
be tendered  unless  otherwise  specified  on the last page of this  letter.  An
envelope to return your instructions to us is enclosed. YOUR INSTRUCTIONS SHOULD
BE  FORWARDED TO US IN AMPLE TIME TO PERMIT US TO SUBMIT A TENDER ON YOUR BEHALF
PRIOR TO THE EXPIRATION OF THE OFFER.

     The  Purchaser  is not aware of any state  where the making of the Offer is
prohibited  by  administrative  or judicial  action  pursuant to any valid state
statute.  If the Purchaser becomes aware of any valid state statute  prohibiting
the making of the Offer or the acceptance of the Common Shares pursuant thereto,
the Purchaser  will make a good faith effort to comply with such statute or seek
to have such statute  declared  inapplicable  to the Offer.  If, after such good
faith effort,  the Purchaser  cannot comply with such state  statute,  the Offer
will not be made to (nor will tenders be accepted  from or on behalf of) holders
of Common Shares in such state.





             Instructions With Respect to the Offer to Purchase for Cash

                     All Outstanding Shares of Common Stock

                                       of

                         CSI Computer Specialists, Inc.

                                       by

                            Interactive Systems, Inc.

     The undersigned  acknowledge(s)  receipt of your letter, the enclosed Offer
to  Purchase,  dated April 26, 2000 (the "Offer to  Purchase"),  and the related
Letter of Transmittal (which together with the Offer to Purchase  constitute the
"Offer") in connection with the offer by Interactive  Systems,  Inc., a Virginia
corporation  (the  "Purchaser"),  to purchase all  outstanding  shares of Common
Stock,  par value  $0.001  per share  (the  "Common  Shares"),  of CSI  Computer
Specialists,  Inc.,  a Delaware  corporation,  at a purchase  price of $1.00 per
Common Share,  net to the seller in cash,  without  interest  thereon,  upon the
terms and subject to the conditions set forth in the Offer to Purchase.

     This will  instruct  you to tender to the  Purchaser  the  number of Common
Shares  indicated below (or if no number is indicated  below, all Common Shares)
which are held by you for the  account  of the  undersigned,  upon the terms and
subject to the conditions set forth in the Offer.

Number of Common Shares
to Be Tendered:            Common Shares*

                                                                       SIGN HERE

                                  Signature(s)

                                                     Please print name(s)

                                     Address

                                                    Area Code & Telephone Number

                                                     Tax Identification and
                                                     Social Security Number(s)

*     Unless otherwise indicated, it will be assumed that all Common Shares held
      by us for your account are to be tendered.