Exhibit 10.93(a)


                                October 17, 2002


Robert Farias
3436 Verdugo Road, Suite 250
Glendale, CA 91208


         Re: CANCELLATION OF PRIOR LOAN/REVISED LOAN/ PUT AND CALL AGREEMENT

Dear Robert,

     This letter  agreement  (the  "Agreement")  is  intended to cancel  several
transactions  between you,  Robert  Farias  ("Farias"),  and  Vertical  Computer
Systems,  Inc.  ("Vertical") that took place in October and November of 2001 and
substitute revised  agreements.  The parties acknowledge and agree that Paradigm
Sales, Inc. ("Paradigm") acquired from Silicon Valley Bank (the "Bank"), through
foreclosure sale,  certain assets of Adhesive Software (the "Assets") and Farias
loaned  $200,000 to Vertical,  in connection with two written  Promissory  Notes
issued by  Vertical to Farias'  favor,  dated  October 31, 2001 and  November 7,
2001,  respectively  (the  "Farias  Notes").  Of those sums  loaned by Farias to
Vertical,  $100,000 was paid by Farias  directly to Paradigm as the cash portion
of the purchase price of the Assets on Vertical's behalf.

The parties therefore agree as follows:

1.   The "Prior Loan Documents" shall mean to include the following: (a) the two
(2) Farias Notes for $100,000 each issued by Vertical Computer Systems to Robert
Farias dated, October 31, 2001 and November 7, 2001, respectively,  (b) the term
sheet, dated October 31, 2001, (c) the Stock Pledge Agreement, dated October 31,
2001, (d) the Wade Pledge Agreement,  dated October 31, 2001, and any amendments
to any of the foregoing agreements.

2.   The  "Revised  Loan  Documents"  shall mean to  include:(a)  a  $181,583.70
promissory  note issued by Vertical  Computer  Systems to Robert  Farias of even
date herewith,  (b) this Agreement,  and (c) the Stock Pledge  Agreement,  dated
October 17, 2002.



Robert Farias
December 20, 2001
Page 2


3.   Farias  shall  cancel the Farias  Notes and the Prior  Loan  Documents  and
Vertical shall execute the Revised Loan Documents, which shall include:

     (a)  a $181,583.70  promissory  note (the "Note") issue to Farias,  bearing
          12%  interest,  payable  as  follows:  (i) an initial  installment  of
          $10,000  payable upon  execution of the letter  agreement of even date
          herewith (ii) six (6) monthly  payments of $5,000 per month  beginning
          November 5, 2002 and (iii)  $10,000  payments per month  beginning May
          15, 2003 until the principal,  and all interest,  fees,  charges,  and
          other amounts owing hereunder have been paid in full.

     (b)  a Stock  Pledge  Agreement,  of even date  herewith  between  Mountain
          Reservoir  Corporation  ("MRC")  and  Farias,  whereby MRC will pledge
          10,450,000  shares of Vertical  common stock (the "Stock") held by MRC
          to Farias in the event of default.

Both parties agree that the  cancellation  of the Prior Loan  Documents (and any
underlying documents including amendments) shall not be effective until Vertical
has executed the Revised Documents.

4.   (a)  Vertical  and  Paradigm  will  execute a Put and Call  Agreement  with
respect to shares of Vertical's  Class C Preferred Stock that are converted into
shares of Vertical  Common  Stock.  The parties  acknowledge  that each share of
Class C Preferred  Stock may be  converted  into 400 shares of  Vertical  Common
stock.  Paradigm shall have the right to sell to Vertical and Vertical agrees to
redeem the common stock  represented by the 12,500 shares of Vertical's  Class C
Preferred  Stock,  held by  Paradigm,  pursuant to that certain  Asset  Purchase
Agreement,  dated  November  14,  2001  by and  between  Vertical  and  Paradigm
("Paradigm's  Preferred Stock"), at a price of $0.04 per share ("Put"). Such Put
shall  be  exercisable,  upon ten  (10)  days  prior  written  notice  delivered
personally  to Vertical,  on March 17, 2003,  Vertical  shall have the option of
paying the put price within ten (10) business days or issuing an additional 2500
shares of its Class C  Preferred  Stock,  which  shall have the same  conversion
rights.

     (b)  Vertical shall have the option of redeeming, at anytime prior to March
17,  2003,  Paradigm's  holdings of Vertical  Common  Stock  represented  by the
Vertical  Preferred  Stock at a price  of $0.06  per  share  ("Call").  Paradigm
expressly  acknowledges  that its  rights as set forth in  subparagraph  (a) are
expressly conditioned upon this subparagraph (b).

5.   In addition, by executing this Agreement, the parties expressly acknowledge
(a) Farias  loaned  Vertical  $200,000,  (b) Farias paid and  Paradigm  actually
received from Vertical  $100,000 and (c) Vertical  delivered to Paradigm  50,000
shares of  Vertical's  Series  "C" 4%  Cumulative  Preferred  Stock.  Each party
further agrees to execute any documents the other party may reasonably  required
to assure its continued protection and rights.

                                     - 2 -


Robert Farias
December 20, 2001
Page 3


This agreement  will be governed by California  and subject to the  jurisdiction
and venue of the state and federal courts of Los Angeles, California.


                                            Yours truly,


                                            VERTICAL COMPUTER SYSTEMS, INC.


                                            By:
                                                --------------------------------
                                                Richard Wade, President


                                                Mountain Reservoir Corp.



                                            By:
                                                --------------------------------
                                                Frank Mento, President

ACCEPTED AND AGREED:



BY:
     ------------------------------------
     Robert Farias, an individual

Dated:
      ----------------



BY:
     ------------------------------------
     Robert Farias, on behalf of Paradigm

Dated:
      ----------------

                                     - 3 -