Document:

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                                                                   Exhibit 10.25

                     MODIFICATION, RENEWAL AND EXTENSION OF
                           NOTE AND SECURITY AGREEMENT

STATE OF TEXAS      )
                    )      KNOWN ALL PERSONS BY THESE PRESENTS:
COUNTY OF DALLAS    )

         THIS MODIFICATION, RENEWAL AND EXTENSION OF NOTE AND SECURITY AGREEMENT
(this "MODIFICATION") is made and entered into by and between MIGRATEC, INC.
("MAKER") and BEM CAPITAL PARTNERS, L.P. ("PAYEE").

                                   WITNESSETH:

         WHEREAS, Maker executed that certain Promissory Note (as subsequently
modified, renewed and extended, the "NOTE") in the original principal amount of
$100,000.00, dated December 4, 1998, payable to the order of MJ Capital Partners
III, L.P., and subsequently assigned to the Payee, which Note was secured by the
liens created by that certain Security Agreement, dated the same date as the
Note (as subsequently modified, renewed and extended, the "SECURITY AGREEMENT"),
securing collateral which is more particularly described in said Security
Agreement.

         WHEREAS, Maker desires to extend, amend and modify the Note and
Security Agreement, as provided herein, and Payee is agreeable to same, subject
to the terms and conditions set forth herein.

         NOW, THEREFORE, for and in consideration of the foregoing premises and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged and confessed, it is hereby agreed as follows:

         1. The outstanding balance of the Note as of January 26, 2001 is
$250,000.00.

         2. Interest on the Note shall accrue at a rate equal to fifteen percent
(15%) per annum until paid in full.

         3. The Note shall be due and payable as follows: (i) payments of only
interest accrued on the Note shall be payable in arrears of the first day of
every month for the first three (3) months following the date of this
Modification commencing on March 1, 2001; and (ii) twelve (12) approximately
equal payments of principal and interest shall be payable on the first day of
every month thereafter.

         4. This Modification shall be binding upon and shall inure to the
benefit of, the parties hereto and their respective heirs, representatives,
successors and assigns.

         5. This Modification is executed in modification, renewal and extension
of (a) the indebtedness evidenced by the Note, and (b) the Security Agreement,
and not in replacement or extinguishment thereof.

         6. In all other respects, the terms and provisions of the Note and
Security Agreement shall remain unchanged and said instruments, as modified,
extended, supplemented and amended

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hereby, are ratified, adopted and confirmed in all respects by Maker and Payee
and shall continue in full force and effect in accordance with their terms,
conditions and provisions thereof, as modified, extended, supplemented and
amended hereby.

         7. All agreements between Maker and Payee are expressly limited so that
in no contingency or event whatsoever whether by reason of advancement of the
proceeds of the Note, acceleration of maturity of the unpaid principal balance
of the Note, or otherwise, shall the amount paid or agreed to be paid to the
Payee for the use, forbearance or detention of the money exceed the maximum
legal rate. If, from any circumstance whatsoever, fulfillment of any provision
hereof or any other document or instrument evidencing, accruing or relating to
the indebtedness evidenced by the Note shall, at the time fulfillment of such
provision be due, involve transcending the limit of validity prescribed by law
which a court of competent jurisdiction may deem applicable hereto, ipso facto,
the obligation to be fulfilled shall be reduced to the limit of such validity,
and if from any circumstance the Payee shall ever receive as interest an amount
which would exceed the maximum legal rate, such amount shall (a) be applied to
the reduction of the unpaid principal balance due under the Note, and not to the
payment of interest or (b) be refunded to Maker. All sums paid or agreed to be
paid to the Payee for the use, forbearance, or detention of the indebtedness of
Maker to Payee shall, to the extent permitted by applicable law, be amortized,
prorated, allocated and spread throughout the full term of such indebtedness as
uniform throughout its term. If any provision of the Note or the Security
Agreement, or the application thereof to any party or circumstance, is held to
be invalid, the remainder of the Note, and the application of such provision to
other parties or circumstances, shall not be affected thereby, the provisions of
the Note and the Security Agreement being severable in any such instance. This
provision shall control every other provision of all agreements between Maker
and Payee with respect to the indebtedness created by the Note.

         8. In connection herewith, Maker agrees to pay up to a maximum of
$2,000 in actual legal expenses incurred by Payee in connection with this
Modification and a commitment fee equal to 2% of the principal amount of the
Note as of the date hereof to Payee.

         EXECUTED this 26th day of January, 2001.

                                     MAKER:

                                     MIGRATEC, INC.

                                     By: /s/ T. Ulrich Brechbuhl
                                         ---------------------------------------
                                         T. Ulrich Brechbuhl,
                                         President and Chief Financial Officer<PAGE>   1
                                                                   Exhibit 10.26

                       ASSIGNMENT AND ASSUMPTION AGREEMENT

         THIS ASSIGNMENT AND ASSUMPTION AGREEMENT (this "AGREEMENT"), is made as
of the 26th day of January, 2001, by and between MJ CAPITAL PARTNERS III, L.P.
("ASSIGNOR") and BEM CAPITAL PARTNERS, L.P. ("ASSIGNEE").

                                   WITNESSETH:

         WHEREAS, Assignor has right, title and interest in that certain
Promissory Note in the original principal amount of $100,000, dated December 4,
1998, payable by MigraTEC, Inc. (as subsequently modified, renewed and extended,
the "NOTE"), which Note was secured by the liens created by that certain
Security Agreement, dated December 4, 1998 (as subsequently modified, renewed
and extended, the "SECURITY AGREEMENT"), securing collateral which is more
particularly described in said Security Agreement; and

         WHEREAS, Assignor desires to assign to Assignee all of Assignor's
right, title and interest in the Note and the Security Agreement.

         NOW, THEREFORE, for and in consideration of $10.00 and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

         1. Assignment of Rights. Assignor hereby assigns to Assignee all of
Assignor's right, title and interest, in the Note and the Security Agreement,
whether such rights and interests are established by written or oral agreement.

         2. Assumption of Obligations. Assignee hereby accepts the assignment of
such of Assignor's rights and interests and hereby expressly assumes performance
of all of Assignor's obligations with respect thereto which accrue after the
date of this Agreement.

         3. Further Acts. Assignor agrees, at the request of Assignee and at
Assignee's expense, to execute and deliver such other and further documents and
legal instruments, and do all other things reasonably necessary to perfect in
Assignee, its assigns, successors, and legal representatives, all right, title
and interest in and to the Note and the Security Agreement, hereby conveyed and
transferred, throughout the world, including without limitation executing and
delivering any and all powers of attorney, applications, assignments,
declarations and affidavits.

         4. Amendment. This Agreement may only be amended by written agreement
signed by each of the parties hereto.

         5. Applicable Law. This Agreement shall be governed and construed by
the internal laws of the State of Texas.

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         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed on the day and year first above written.

MJ CAPITAL PARTNERS III, L.P.                   BEM CAPITAL PARTNERS, L.P.

By:  MJB Ventures L.L.C.                        By:
     -----------------------------------------     -----------------------------

     By: /s/ Thomas A. Montgomery                  By: /s/ Joe Ballew
         -------------------------------------        --------------------------
         Name: Thomas A. Montgomery                   Name: Joe Ballew
              --------------------------------             ---------------------
         Title: Manager of the General Partner        Title: Partner
               -------------------------------              --------------------<PAGE>   1
                                                                   Exhibit 10.27

THE WARRANT SECURITIES TO BE RECEIVED UPON EXERCISE OF THIS WARRANT HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, OR QUALIFIED UNDER
ANY STATE SECURITIES LAWS. THE WARRANT SECURITIES MAY NOT BE OFFERED, SOLD,
PLEDGED, HYPOTHECATED OR OTHERWISE TRANSFERRED, WHETHER OR NOT FOR
CONSIDERATION, IN THE ABSENCE OF (1) AN EFFECTIVE REGISTRATION STATEMENT AND
QUALIFICATION WITH RESPECT TO THE WARRANT SECURITIES UNDER THE SECURITIES ACT
AND UNDER ANY APPLICABLE STATE SECURITIES LAWS OR (2) AN EXEMPTION FROM SUCH
QUALIFICATION AND REGISTRATION.

                          COMMON STOCK PURCHASE WARRANT

                                January 31, 2001

MigraTEC, Inc., a Delaware corporation (the "COMPANY"), does hereby certify and
agree that, for good and valuable consideration (the existence, sufficiency and
receipt of which are hereby acknowledged by the Company), BEM Capital Partners,
L.P., a Texas limited partnership, its successors, and assigns ("HOLDER"),
hereby is entitled to purchase from the Company, during the term set forth in
Section 1 hereof, up to an aggregate amount of 40,000 shares (the "EXERCISE
QUANTITY") of duly authorized, validly issued, fully paid and non-assessable
shares of Common Stock, par value $0.001 per share (the "COMMON STOCK"), of the
Company, all upon the terms and provisions and subject to adjustment of such
Exercise Quantity provided in this Common Stock Purchase Warrant (this
"Warrant"). The exercise price per share of Common Stock for which this Warrant
is exercisable shall be $ .01 [MARKET PRICE ON THE DATE OF GRANT], as adjusted
from time to time pursuant to the terms of this Warrant (the "EXERCISE PRICE").

         1. Term of the Warrant. The term of this Warrant commences as of the
date hereof, and shall expire at 5:00 P.M., Central time, on January 31, 2002.

         2. Exercise of Warrant.

            (a) This Warrant may be exercised by the Holder of this Warrant at
any time during the term hereof, in whole or in part, from time to time (but not
for fractional shares, unless this Warrant is exercised in whole), by
presentation and surrender of this Warrant to the Company, together with the
annexed Exercise Form duly completed and executed and payment in the aggregate
amount equal to the Exercise Price multiplied by the number of shares of Common
Stock being purchased. At the option of Holder, payment of the Exercise Price
may be made either by (i) certified check payable to the order of the Company,
(ii) SURRENDER OF CERTIFICATES THEN HELD REPRESENTING, OR DEDUCTION FROM THE
NUMBER OF SHARES ISSUABLE UPON EXERCISE OF THIS WARRANT, OF THAT NUMBER OF
SHARES WHICH HAS AN AGGREGATE VALUE DETERMINED USING THE DIFFERENCE OF THE
AVERAGE OF THE BID AND ASK PRICE OF THE COMPANY'S COMMON STOCK ON THE DATE OF
EXERCISE LESS THE EXERCISE PRICE FOR SUCH SHARES EQUAL TO THE

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AGGREGATE EXERCISE PRICE FOR ALL SHARES TO BE PURCHASED PURSUANT TO THIS
WARRANT, OR (iii) BY ANY COMBINATION OF THE FOREGOING METHODS. Within five
business days of the Company's receipt of this Warrant, the completed and signed
Exercise Form and the requisite payment (if any), the Company shall issue and
deliver (or cause to be delivered) to the exercising Holder stock certificates
aggregating the number of shares of Common Stock purchased.

         (b) In the event the Holder of this Warrant desires that any or all of
the stock certificates to be issued upon the exercise hereof be registered in a
name or names other than that of the Holder of this Warrant, the Holder must (i)
so request in writing at the time of exercise if the transfer is not a
registered transfer, and (ii) provide to the Company evidence reasonably
satisfactory to the Company to the effect that the proposed transfer may be
effected without registration under the Securities Act.

         (c) Upon the due exercise by the Holder of this Warrant, whether in
whole or in part, the Holder (or any other person to whom a stock certificate is
to be so issued) shall be deemed for all purposes to have become the Holder of
record of the shares of Common Stock for which this Warrant has been so
exercised, effective immediately prior to the close of business on the date this
Warrant, the completed and signed Exercise Form and the requisite payment were
duly delivered to the Company, irrespective of the date of actual delivery of
certificates representing such shares of Common Stock so issued.

         If the Company, by stock dividend, split, reverse split,
reclassification of shares, or otherwise, changes as a whole the outstanding
shares of Common Stock issuable upon exercise of this Warrant into a different
number or class of shares, then: (1) the number and class of shares so changed
shall, for the purposes of this Warrant, replace the shares outstanding
immediately prior to the change; and (2) the Exercise Price in effect, and the
Exercise Quantity under this Warrant, immediately prior to the date upon which
the change becomes effective, shall be proportionately adjusted (the price to
the nearest cent). Irrespective of any adjustment or change in the Exercise
Price or the Exercise Quantity under this or any other Warrant of like tenor,
the Warrants theretofore and thereafter issued may continue to express the
Exercise Price per share and the Exercise Quantity as the Exercise Price per
share and the Exercise Quantity were expressed in the Warrant when initially
issued.

         If the Company consolidates with or merges into another corporation,
the registered owner shall thereafter be entitled on exercise to purchase, with
respect to each share of Common Stock purchasable hereunder immediately before
the consolidation or merger becomes effective, the securities or other
consideration to which a holder of one share of securities purchasable hereunder
is entitled in the consolidation or merger without any change in or payment in
addition to the Exercise Price in effect immediately prior to the merger or
consolidation. The Company shall take any necessary steps in connection with a
consolidation or merger to assure that all the provisions of this Warrant shall
thereafter be applicable, as early as reasonably may be, to any securities or
other consideration so deliverable on exercise of this Warrant. The Company
shall not consolidate or merge unless, prior to consummation, the successor
corporation (if other than the Company) assumes the obligations of this
paragraph by

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written instrument exercised and mailed to the Holder at the address of the
Holder on the books of the Company. A sale or lease of all or substantially all
of the assets of the Company for a consideration (apart from the assumption of
obligations) consisting primarily of securities is a consolidation or merger for
the foregoing purposes.

         On the happening of an event requiring an adjustment of the Exercise
Price or the Exercise Quantity, the Company shall forthwith give written notice
to the registered owner stating the adjusted Exercise Price and the adjusted
number and kind of securities or other property purchasable hereunder resulting
from the event and setting forth in reasonable detail the method of calculation
and the facts upon which the calculation is based. The Board of Directors of the
Company, acting in good faith, shall determine the calculation.

      3. Surrender of Warrant; Expenses.

         (a) Whether in connection with the exercise, exchange or registration
of transfer or replacement of this Warrant, surrender of this Warrant shall be
made to the Company during normal business hours on a business day (unless the
Company otherwise permits) at the executive offices of the Company or to such
other office or duly authorized representative of the Company as from time to
time may be designated by the Company by written notice given to the Holder of
this Warrant.

         (b) The Company shall pay all costs and expenses incurred in connection
with the exercise, registering, exchange, transfer or replacement of this
Warrant, including the costs of preparation, execution and delivery of warrants
and stock certificates, and shall pay all taxes (other than any taxes measured
by the income of any Person other than the Company) and other charges imposed by
law payable in connection with the transfer or replacement of this Warrant.

         (c) The Company shall deliver or cause to be delivered to the Holder
exercising this Warrant or any portion hereof certificates representing the
shares of Common Stock issuable upon such exercise within five business days of
the surrender and delivery by such Holder to the Company of this Warrant and a
duly completed Exercise Form and the requisite payment.

      4. Warrant Register; Exchange; Transfer; Loss.

         (a) The Company at all times shall maintain at its chief executive
offices an open register for all Warrants, in which the Company shall record the
name and address of each person to whom a Warrant has been issued or
transferred, the number of shares of Common Stock or other securities
purchasable hereunder and the corresponding purchase prices.

         (b) This Warrant may be exchanged for two or more warrants entitling
the identical Holder hereof to purchase the same aggregate Exercise Quantity at
the same Exercise Price per share and otherwise having the same terms and
provisions as this Warrant. The identical Holder may request such an exchange by
surrender of this Warrant to the Company,

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together with a written exchange request specifying the desired number of
warrants and allocation of the Exercise Quantity purchasable under the existing
Warrant.

         (c) This Warrant may be transferred, in whole or in part, by the Holder
or any duly authorized representative of such Holder. A transfer may be
registered with the Company by submission to it of this Warrant, together with
the annexed Assignment Form duly completed and executed, and evidence reasonably
satisfactory to the Company that such transfer is in compliance with federal and
state securities laws. Within five business days after the Company's receipt of
this Warrant and the Assignment Form so completed and executed, the Company will
issue and deliver to the transferee a new Warrant representing the portion of
the Exercise Quantity transferred at the same Exercise Price per share and
otherwise having the same terms and provisions as this Warrant, which the
Company will register in the new Holder's name.

         (d) Upon receipt by the Company of evidence reasonably satisfactory to
it of the ownership of and the loss, theft, destruction or mutilation of this
Warrant, and (a) in the case of loss, theft or destruction, upon receipt by the
Company of indemnity reasonably satisfactory to it, or (b) in the case of
mutilation, upon surrender and cancellation thereof, the Company, at its
expense, will execute, register and deliver, in lieu thereof, a new certificate
or instrument for (or covering the purchase of) this Warrant.

         (e) The Company will not close its books against the transfer of this
Warrant or any of the Warrant Securities in any manner which interferes with the
timely exercise of this Warrant. The Company will from time to time take all
such action as may be necessary to assure that the par value per share of the
unissued Common Stock acquirable upon exercise of this Warrant is at all times
equal or less than the Exercise Price then in effect.

      5. Limited Rights of the Holder. This Warrant does not entitle the
owner to any voting rights or other rights as a stockholder of the Company, or
to any other rights whatsoever, except the rights herein expressed. No dividends
are payable or will accrue on this Warrant or the shares purchaseable hereunder
until, and except to the extent that, this Warrant is exercised.

           [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK.]

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         IN WITNESS WHEREOF, the Company has caused this Warrant to be executed
by its duly authorized representative.

                                    MIGRATEC, INC.

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

Warrant Signature Page
<PAGE>   6

                                 MigraTEC, Inc.
                                  EXERCISE FORM

MigraTEC, Inc.  (the "Company")

         The undersigned hereby irrevocably elects to exercise the right of
purchase represented by the within Warrant Certificate for, and to purchase
thereunder, ______ shares of common stock of the Company (the "Warrant
Securities"), and requests that certificates for the Warrant Securities be
issued in the name of:

         ---------------------------------------------------------------
         (Please print or Type Name, Address and Social Security Number)

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

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

and, if said number of shares of Warrant Securities shall not be all the Warrant
Securities purchasable hereunder, that a new Warrant Certificate for the balance
of the Warrant Securities purchasable under the within Warrant Certificate be
registered in the name of the undersigned Holder or his Assignee as below
indicated and delivered to the address stated below.

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

Name of Holder
or Assignee:
             ----------------------------
                    (Please Print)

Address:
             ----------------------------

             ----------------------------
Signature:
             ----------------------------

Note: The above signature must correspond with the name as it appears upon the
face of this Warrant Certificate in every particular, without alteration or
enlargement or any change whatever, unless these Warrants have been assigned.

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                                   ASSIGNMENT
                 (To be signed only upon assignment of Warrants)

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
the right to purchase ______ shares of common stock represented by the within
Warrant Certificate unto, and requests that a certificate for such Warrant be
issued in the name of:

         ---------------------------------------------------------------
         (Please print or Type Name, Address and Social Security Number)

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

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

The undersigned hereby irrevocably constitutes and appoints
________________________ Attorney to transfer said Warrant on the books of the
Company, with full power of substitution in the premises and, if said number of
shares of common stock shall not be all of the common stock purchasable under
the within Warrant Certificate, that a new Warrant Certificate for the balance
of the common stock purchasable under the within Warrant Certificate be
registered in the name of the undersigned Holder and delivered to such Holder's
address as then set forth on the Company's books.

Dated:
      --------------------              ----------------------------------------
                                                  Signature of Registered Holder

Note: The above signature must correspond with the name as it appears upon the
face of this Warrant Certificate in every particular, without alteration or
enlargement or any change whatever.

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