Document:

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                                                                   EXHIBIT 10.21

                    LEASE MODIFICATION AGREEMENT NUMBER ONE

     THIS LEASE MODIFICATION AGREEMENT NUMBER ONE is made this 16th day of
November, 2000 by and between CHARTER CROWN PLAZA PARTNERS, L.P. herein called
"Landlord", and MIGRATEC INC., herein called "Tenant".

     WHEREAS, by a lease dated April 12, 2000 (the "Lease"), Landlord did lease
to Tenant Suite 100 on the first (1st) floors(s) in Owner's office building
located at 11494 Luna Road, Dallas, Texas 75234. Said space consists of
approximately 9,988 rentable square feet, is shown in Exhibit B attached to said
Lease, and is herein called the "Premises"; and

     WHEREAS, the parties desire to expand the Premises and make certain changes
to said Lease.

                                   AGREEMENT

     NOW, THEREFORE, in consideration of the mutual covenants contained herein
and in said Lease the parties hereto agree as follows:

     1. Expansion of Premises: Effective December 1, 2000, the Premises shall be
        expanded by 2,325 rentable square feet (the "Expansion Premises") as
        shown on Exhibit A attached hereto. The total rentable square footage of
        the Premises shall be 12,313 rentable square feet.

     2. Lease Term: Effective December 1, 2000, the Lease Term shall be extended
        by seven (7) months such that the new termination date shall be February
        28, 2004.

     3. Base Rental: Effective December 1, 2000, the Base Rental shall be as
        follows:

        December 2000 through August 2000:        $16,727.00 per month
        September 2001 through February 2004:     $18,470.00 per month

        In addition, the rental charged for the Tenant's sign on the Building
        shall be adjusted from $500.00 per month to $250.00 per month, effective
        December 1, 2000.

     4. Tenant Improvements: Tenant accepts Premises in "as is" condition.

     5. Miscellaneous:

        a. The provisions of this Lease Modification Agreement Number One shall
           remain in full force and effect for the duration of the term of said
           Lease.

        b. Except as otherwise set forth herein, all of the terms and conditions
           of said Lease shall remain in full force and effect, and shall remain
           fully applicable to the Premises, throughout the duration of the term
           of said Lease. Said Lease, as amended herein, constitutes the entire
           agreement between the parties hereto, and no further modification of
           said Lease shall be binding unless evidence by an agreement in
           writing signed by Landlord and Tenant.

        c. The captions and paragraph numbers appearing in this Agreement are
           inserted only as a matter of convenience and in no way define, limit,
           construe, affect or describe the scope or intent of the provisions in
           this Agreement.

     6. Execution Requirement; Counterparts; Telecopy. The submission by
        Landlord to Tenant of an unsigned copy of this instrument for
        examination, negotiation or signature does not constitute an option for,
        or a representation by Landlord regarding, a prospective Modification.
        This Modification shall be effective if and when (and only if and when)
        it has been executed by Landlord and Tenant; however, counterpart
        execution and delivery of a signed copy by telecopy transmission shall
        be effective with regard to signing party(ies).

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LANDLORD:

CHARTER CROWN PLAZA PARTNERS, L.P.
a Texas limited partnership

       By:  Charter Crown Plaza Investments, L.P.,
            its general partner

By: /s/ RAY W. WASHBURNE
    ---------------------------
    Ray W. Washburne
    President

Date: 11/27/00
      -------------------------

TENANT:

MigraTEC, INC.,
a Florida corporation

By: /s/ T. ULRICH BRECHBUHL
    ---------------------------

Name: T. Ulrich Brechbuhl
      -------------------------

Title: PRESIDENT & CFO
       ------------------------

Date: 11/20/00
      -------------------------
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                                  EXHIBIT "A"

                                  [FLOORPLAN]

                                                                    CROWN PLAZA
                                         --------------------------------------
                                         11494 LUNA ROAD, FARMERS BRANCH, TEXAS
                                                     BUILDING "B" - FIRST FLOOR

                             Managed and Leased By
                               FOBARE COMMERCIAL
 5757 ALPHA ROAD-SUITE 101-DALLAS, TX 75240-(972) 458-7585-FAX (972) 458-0267
                                                              NOVEMBER 14, 2000<PAGE>   1
                                                                   Exhibit 10.22

                                 MIGRATEC, INC.

                                 PROMISSORY NOTE

$565,000.00                                                     December 1, 2000

         MigraTEC, Inc., a Delaware corporation (the "COMPANY"), hereby promises
to pay to Mercury Fund No. 1, Ltd., a Texas limited partnership (or its
successors and assigns) ("PAYEE"), the principal sum of Five Hundred Sixty-Five
Thousand Dollars ($565,000) together with interest at the rates set forth herein
(collectively, the "LOAN AMOUNT"), upon Maturity (as such term is defined
below). This Promissory Note (the "Note") represents the definitive agreement
contemplated by that certain Letter Agreement for Bridge Financing, dated
December 1, 2000, and executed by the Company and the Payee.

         Interest on this Note shall accrue at a rate per annum equal to (i)
zero percent (0%) for the first thirty (30) days following the date of this
Note; (ii) two percent (2%) for the next thirty (30) days; (iii) four percent
(4%) for the next thirty (30) days; (iv) six percent (6%) for the next thirty
(30) days; (v) eight percent (8%) for the next thirty (30) days; (vi) ten
percent (10%) for the next thirty (30) days; and (vii) four and one-half percent
(4.5%) thereafter until repaid in full. Interest shall be calculated on the
basis of a 365 day year.

         This Note shall be due and payable in full at Maturity. For purposes of
this Note, "Maturity" shall be the first to occur of (i) December 31, 2001; or
(ii) the closing of a Qualified Financing (as such term is hereinafter defined).
For purposes of this Note, a "QUALIFIED FINANCING" means the consummation by the
Company of the next equity or equity related financing which raises proceeds of
at least Two Million Dollars ($2,000,000). The funding provided pursuant to this
Note or any agreement contemplated by its Note shall not be included for
purposes of determining a Qualified Financing.

         Upon the Maturity of this Note, Payee shall be entitled to demand
immediate repayment of this Note in full or in part. Upon a Qualified Financing,
the Loan Amount shall be redeemed out of the proceeds of the Qualified
Financing; provided, however, that Payee agrees that upon such repayment of the
Loan Amount, at the request of the Company, Payee will use the proceeds of such
repayment to purchase shares of common stock, par value $.001 per share (the
"COMMON STOCK"), of the Company pursuant to the exercise of warrants issued to
Payee under that certain Note and Warrant Purchase Agreement, dated as of
January 25, 2000, among the Company, Payee and MT Partners, L.P.

         In the event that Payee demands repayment of all or a portion of this
Note, payment shall be made by wire transfer of immediately available funds on
the date due to such bank account that Payee shall designate to the Company in
writing.

         The invalidity, or unenforceability in particular circumstances, of any
provision of this Note shall not extend beyond such provision or such
circumstances and no other provision of this Note shall be affected thereby. If
the applicable law is ever judicially interpreted so as to render usurious any
amount called for under this Note or under any of the other documents
evidencing, securing or relating to this Note or any part thereof, including the
Security Agreement dated of even date hereof by and between the Company and
Payee, or contracted for, charged, taken, reserved or received with respect to
the indebtedness evidenced by this Note (the "LOAN"), then it is the Company's
and Payee's express intent that all excess amounts theretofore collected by
Payee be credited on the principal balance of this Note (or, if this Note has
been or would

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thereby be paid in full, refunded to the Company), and the provisions of this
Note and the Security Agreement immediately be deemed reformed and the amounts
thereafter collectible hereunder and thereunder reduced, without the necessity
of the execution of any new document, so as to permit the recovery of the
fullest amount called for hereunder and thereunder, while complying in all
respects with the applicable law and regulations.

         The Company and each party, if any, now or hereafter liable for payment
of any sums of money payable on this Note, jointly and severally, waive
presentment and demand for payment, notice of intent to accelerate and notice of
acceleration, protest and notice of protest and nonpayment, and diligence in
collecting or bringing suit against any party liable hereon, and agree that
their liability on this Note shall not be affected by any renewal or extension
in time of payment hereof, by any indulgence, or by any release, modification,
or substitution of any security for the payment of this Note, and hereby consent
to any and all extensions, renewals, replacements, waivers, releases, or
exchanges affecting this Note and the taking, release, modification, or
substitution of any security, with or without notice and before or after
maturity.

         This Note and the Company's obligations hereunder are secured in favor
of Payee in accordance with the terms and conditions of that certain Security
Agreement between the Company and Payee, dated of even date hereof.

         This Note shall be binding upon and inure to the benefit of the
Company, its successors and assigns, and shall inure to the benefit of the
Payee, its successors and permitted assigns. In the event this Note is placed in
the hands of an attorney for collection or suit is filed hereon or if
proceedings are had in bankruptcy, receivership, reorganization, or other legal
or judicial proceedings for the collection hereof, the Company hereby agrees to
pay to the holder of this Note reasonable attorneys' fees, and shall pay all
additional reasonable costs and expenses of collection and enforcement.

         THE SUBSTANTIVE LAWS OF THE STATE OF TEXAS SHALL GOVERN THE VALIDITY,
CONSTRUCTION, ENFORCEMENT, AND INTERPRETATION OF THIS NOTE WITHOUT REGARD TO
CONFLICT OF LAWS PROVISIONS WITH A FORUM AND VENUE OF DALLAS COUNTY, TEXAS.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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         IN WITNESS WHEREOF, the Company has caused its duly authorized officer
to execute this Note as of the day and year first written above.

                                   MIGRATEC, INC.

                                   By:    /s/ T. Ulrich Brechbuhl
                                          -------------------------------------
                                   Name:  T. Ulrich Brechbuhl
                                   Title: President and Chief Financial Officer

Promissory Note Signature Page

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