EXHIBIT 10.90
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                        AMENDMENT TO CONSULTING AGREEMENT

This  agreement  (the  "Amendment")  shall  amend  the  terms of the  Consulting
Agreement,  dated  July 13,  2001,  by and  between  Vertical  Computer  Systems
("Vertical")  and Steven  Rossetti  ("Contractor").  The parties hereby agree to
amend the Agreement as follows:

1. Vertical  agrees to pay  Contractor  $30,000.00  in cash and issue  1,000,000
warrants  at a strike  price of $0.012 per share,  which shall  constitute  full
settlement of all  consideration  owed to Contractor up to and including  August
31, 2002.

2. The term of this Agreement will continue for one year, and, in  consideration
for providing  future  services by Contractor on its behalf,  Vertical shall pay
Contractor five thousand dollars ($5,000) for each month of services rendered by
Contractor.  The expense reimbursement provisions of the July 13, 2001 agreement
shall remain in effect for the term of this agreement.

3. Contractor shall continue to act in the capacity of Executive V.P.,
Government Affairs for Vertical.

4. The Non-Disclosure and  Non-Solicitation  Agreement ("NDA"),  entered into on
Sepetember 11, 2002, between the parties,  shall govern this Agreement beginning
on the effective date of the NDA. The NDA shall also be amended as follows:  the
term of the NDA shall be extended by the period that this Agreement runs. By way
of example, if this Agreement runs for six (6) months, then six (6) months shall
be added to the term of the NDA.

5. As between the  Agreement  and this  Amendment,  the terms of this  Amendment
shall  control.  Except as modified  herein,  the terms of the  Agreement  shall
remain in full force and effect.

The parties  hereby agree to the terms  amending the Agreement  this 11th day of
September 2002.


                              "VERTICAL"

                              --------------------------
                              Richard Wade/President, CEO
                              Vertical Computer Systems, Inc.


ACCEPTED AND AGREED:

"CONTRACTOR"

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Steven Rossetti