Document:

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                                                                   EXHIBIT 10.13

                               MSI HOLDINGS, INC.
                              (A UTAH CORPORATION)

                            =======================

                               WARRANT TO PURCHASE
                             SHARES OF COMMON STOCK

                            =======================

                           Effective January 14, 2000

          THE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES
          SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND MAY NOT
          BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED WITHIN THE UNITED
          STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS EXCEPT
          (1) PURSUANT TO A REGISTRATION STATEMENT WHICH HAS BEEN DECLARED
          EFFECTIVE UNDER THE SECURITIES ACT, OR (2) PURSUANT TO AN EXEMPTION
          FROM REGISTRATION PROVIDED UNDER THE SECURITIES ACT (IF AVAILABLE),
          AND IN EACH CASE IN ACCORDANCE WITH ANY APPLICABLE SECURITIES LAWS OF
          ANY STATE OF THE UNITED STATES OR OTHER JURISDICTION.

     THIS CERTIFIES THAT, for value received, TSG Financial Limited Partnership,
a Texas limited partnership, or registered assigns ("Holder"), is entitled to
purchase, subject to the conditions set forth below, at any time or from time to
time during the Exercise Period (as defined in subsection 1.2, below), Two
Hundred Thousand (200,000) shares ("Shares") of fully paid and non-assessable
Common Stock, $0.10 par value ("Common Stock"), of MSI HOLDINGS, INC., a Utah
corporation (the "Company"), at the per share purchase price (the "Warrant
Price") set forth in subsection 1.1, subject to the further provisions of this
Warrant. The term "Warrants" as used herein shall mean this Warrant and all
instruments issued by the Company which are substantially identical to this
Warrant (except for the name of the holder and the number of securities
purchasable by the holder).

1.   EXERCISE OF WARRANT

     The terms and conditions upon which this Warrant may be exercised, and the
Common Stock covered hereby may be purchased, are as follows:

     1.1  Warrant Price. The Warrant Price shall be equal to $0.10 per share,
subject to adjustment as provided in Section 4, below.

     1.2  Method Of Exercise. The holder of this Warrant, may at any time
beginning January 14, 2000, and prior to January 14, 2005, or such later date as
the Company may in its sole discretion determine (the "Exercise

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Period"), exercise in whole or in part the purchase rights evidenced by this
Warrant. Such exercise shall be effected by:

     (a)  the surrender of the Warrant, together with a duly executed copy of
the form of subscription attached hereto, to the Secretary of the Company at its
principal offices;

     (b)  the payment to the Company, by cash, check payable to its order or
wire transfer, of an amount equal to the aggregate Warrant Price for the number
of Shares for which the purchase rights hereunder are being exercised; and

     (c)  the delivery to the Company, if necessary, to assure compliance with
federal and state securities laws, of an instrument executed by the holder
certifying that the Shares are being acquired for the sole account of the holder
and not with a view to any resale or distribution.

     1.3  Satisfaction with Requirements of Securities Act of 1933.
Notwithstanding the provisions of subsection 1.2(c) and Section 7, each and
every exercise of this Warrant is contingent upon the Company's satisfaction
that the issuance of Common Stock upon the exercise is exempt from the
requirements of the Securities Act of 1933, as amended (the "Securities Act"),
and all applicable state securities laws. The holder of this Warrant agrees to
execute any and all documents deemed necessary by the Company to effect the
exercise of this Warrant.

     1.4  Issuance Of Shares and New Warrant. In the event the purchase rights
evidenced by this Warrant are exercised in whole or in part, one or more
certificates for the purchased Shares shall be issued as soon as practicable
thereafter to the person exercising such rights. Such holder shall also be
issued at such time a new Warrant representing the number of Shares (if any) for
which the purchase rights under this Warrant remain unexercised and continuing
in force and effect.

2.   TRANSFERS

     2.1  Transfers. Subject to Section 7 hereof, this Warrant and all rights
hereunder are transferable in whole or in part by the holder. The transfer shall
be recorded on the books of the Company upon the surrender of this Warrant,
properly endorsed, to the Secretary of the Company at its principal offices and
the payment to the Company of all transfer taxes and other governmental charges
imposed on such transfer. In the event of a partial transfer, the Company shall
issue to the several holders one or more appropriate new Warrants.

     2.2  Registered Holder. Each holder agrees that until such time as any
transfer pursuant to subsection 2.1 is recorded on the books of the Company, the
Company may treat the registered holder of this Warrant as the absolute owner;
provided that nothing herein affects any requirement that transfer of any
Warrant or share of Common Stock issued or issuable upon the exercise thereof be
subject to compliance with the Securities Act and all applicable state
securities laws.

     2.3  Form Of New Warrants. All Warrants issued in connection with transfers
of this Warrant shall bear the same date as this Warrant and shall be
substantially identical in form and provision to this Warrant except for the
number of Shares purchasable thereunder.

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3.   FRACTIONAL SHARES

     Notwithstanding that the number of Shares purchasable upon the exercise of
this Warrant may have been adjusted pursuant to the terms hereof, the Company
shall nonetheless not be required to issue fractions of Shares upon exercise of
this Warrant or to distribute certificates that evidence fractional shares nor
shall the Company be required to make any cash payments in lieu thereof upon
exercise of this Warrant. Holder hereby waives any right to receive fractional
Shares.

4.   ANTIDILUTION PROVISIONS

     4.1  Stock Splits And Combinations. If the Company shall at any time
subdivide or combine its outstanding shares of Common Stock, this Warrant shall,
after that subdivision or combination, evidence the right to purchase the number
of shares of Common Stock that would have been issuable as a result of that
change with respect to the Shares of Common Stock that were purchasable under
this Warrant immediately before that subdivision or combination. If the Company
shall at any time subdivide the outstanding shares of Common Stock, the Warrant
Price then in effect immediately before that subdivision shall be
proportionately decreased, and, if the Company shall at any time combine the
outstanding shares of Common Stock, the Warrant Price then in effect immediately
before that combination shall be proportionately increased. Any adjustment under
this section shall become effective at the close of business on the date the
subdivision or combination becomes effective.

     4.2  Reclassification, Exchange and Substitution. If the Common Stock
issuable upon exercise of this Warrant shall be changed into the same or a
different number of shares of any other class or classes of stock, whether by
capital reorganization, reclassification, or otherwise (other than a subdivision
or combination of shares provided for above), the holder of this Warrant shall,
on its exercise, be entitled to purchase for the same aggregate consideration,
in lieu of the Common Stock that the holder would have become entitled to
purchase but for such change, a number of shares of such other class or classes
of stock equivalent to the number of shares of Common Stock that would have been
subject to purchase by the holder on exercise of this Warrant immediately before
that change.

     4.3  Reorganizations, Mergers, Consolidations Or Sale Of Assets. If at any
time there shall be a capital reorganization of the Company's Common Stock
(other than a stock split, combination, reclassification, exchange, or
subdivision of shares provided for elsewhere above) or merger or consolidation
of the Company with or into another corporation, or the sale of the Company's
properties and assets as, or substantially as, an entirety to any other person,
then, as a part of such reorganization, merger, consolidation or sale, lawful
provision shall be made so that the holder of this Warrant shall thereafter be
entitled to receive upon exercise of this Warrant, during the period specified
in this Warrant and upon payment of the Warrant Price then in effect, the number
of shares of Common Stock or other securities or property of the Company, or of
the successor corporation resulting from such merger or consolidation, to which
a holder of the Common Stock deliverable upon exercise of this Warrant would
have been entitled in such capital reorganization, merger or consolidation or
sale if this Warrant had been exercised immediately before that capital
reorganization, merger or consolidation or sale. In any such case, appropriate
adjustment (as determined in good faith by the Company's Board of Directors)
shall be made in the application of the provisions of this Warrant with respect
to the rights and interests of the holder of this Warrant after the
reorganization, merger, consolidation, or sale to the end that the provisions of
this Warrant (including adjustment of the Warrant Price then in effect and
number of Shares purchasable upon exercise of this Warrant) shall be applicable
after that event, as near as reasonably may be, in relation to any shares or
other property deliverable after that event upon exercise of this Warrant. The
Company shall, within thirty (30) days after making such adjustment, give
written notice (by first class mail, postage prepaid) to the registered holder
of this Warrant

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at the address of that holder shown on the Company's books. That notice shall
set forth, in reasonable detail, the event requiring the adjustment and the
method by which the adjustment was calculated and specify the Warrant Price then
in effect after the adjustment and the increased or decreased number of Shares
purchasable upon exercise of this Warrant. When appropriate, that notice may be
given in advance and be included as part of the notice required under other
provisions of this Warrant.

     4.4  Common Stock Dividends; Distributions. In the event the Company should
at any time prior to the expiration of this Warrant fix a record date for the
determination of the holders of Common Stock entitled to receive a dividend or
other distribution payable in additional shares of Common Stock or other
securities or rights convertible into or entitling the holder thereof to
receive, directly or indirectly, additional shares of Common Stock (hereinafter
referred to as the "Common Stock Equivalents") without payment of any
consideration by such holder for the additional shares of Common Stock or Common
Stock Equivalents (including the additional shares of Common Stock issuable upon
conversion or exercise thereof), then, as of such record date (or the date of
such distribution, split or subdivision if no record date is fixed), the Warrant
Price shall be appropriately decreased and the number of shares of Common Stock
issuable upon exercise of the Warrant shall be appropriately increased in
proportion to such increase of outstanding shares.

     4.5  Adjustments of Other Distributions. In the event the Company shall
declare a distribution payable in securities of other persons, evidences of
indebtedness issued by the Company or other persons, assets (excluding cash
dividends) or options or rights not referred to in subsection 4.4, then, in each
such case for the purpose of this subsection 4.5, upon exercise of this Warrant
the holder hereof shall be entitled to a proportionate share of any such
distribution as though such holder was the holder of the number of shares of
Common Stock of the Company into which this Warrant may be exercised as of the
record date fixed for the determination of the holders of Common Stock of the
Company entitled to receive such distribution.

     4.6  Certificate as to Adjustments. In the case of each adjustment or
readjustment of the Warrant Price pursuant to this Section 4, the Company will
promptly compute such adjustment or readjustment in accordance with the terms
hereof and cause a certificate setting forth such adjustment or readjustment and
showing in detail the facts upon which such adjustment or readjustment is based,
to be delivered to the holder of this Warrant. The Company will, upon the
written request at any time of the holder of this Warrant, furnish or cause to
be furnished to such holder a certificate setting forth:

     (a)  Such adjustments and readjustments;

     (b)  The purchase price at the time in effect; and

     (c)  The number of shares of Common Stock issuable upon exercise of the
          Warrant and the amount, if any, of other property at the time
          receivable upon the exercise of the Warrant.

     4.7  Reservation of Stock Issuable Upon Exercise. The Company shall at all
times reserve and keep available out of its authorized but unissued shares of
Common Stock solely for the purpose of effecting the exercise of this Warrant
such number of its shares of Common Stock as shall from time to time be
sufficient to effect the exercise of this Warrant and if at any time the number
of authorized but unissued shares of Common Stock shall not be sufficient to
effect the exercise of this Warrant, in addition to such other remedies as shall
be available to the holder of this Warrant, the Company will use its best
efforts to take such corporate action as may, in the opinion of its counsel, be
necessary to increase its authorized but unissued shares of Common Stock to such
number of shares as shall be sufficient for such purposes.

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5.   RIGHTS PRIOR TO EXERCISE OF WARRANT

     This Warrant does not entitle the holder to any of the rights of a
stockholder of the Company, including without limitation, the right to receive
dividends or other distributions, to exercise any preemptive rights, to vote, or
to consent or to receive notice as a stockholder of the Company. If, however, at
any time prior to the expiration of this Warrant and prior to its exercise, any
of the following events shall occur:

     (a)  the Company shall declare any dividend payable in any securities upon
its shares of Common Stock or make any distribution (other than a regular cash
dividend) to the holders of its shares of Common Stock; or

     (b)  the Company shall offer to the holders of its shares of Common Stock
any additional shares of Common Stock or securities convertible into or
exchangeable for shares of Common Stock or any right to subscribe for or
purchase any thereof; or

     (c)  a dissolution, liquidation or winding up of the Company (other than in
connection with a consolidation, merger, sale, transfer or lease of all or
substantially all of its property, assets, and business as an entirety) shall be
proposed and action by the Company with respect thereto has been approved by the
Company's Board of Directors,

Then in any one or more of said events the Company shall give notice in writing
of such event to the holder at his last address as it shall appear on the
Company's records at least twenty (20) days prior to the date fixed as a record
date or the date of closing the transfer books for the determination of the
stockholders entitled to such dividends, distribution, or subscription rights,
or for the determination of stockholders entitled to vote on such proposed
dissolution, liquidation or winding up. Such notice shall specify such record
date or the date of closing the transfer books, as the case may be. Failure to
publish, mail or receive such notice or any defect therein or in the publication
or mailing thereof shall not affect the validity of any action taken in
connection with such dividend, distribution or subscription rights, or such
proposed dissolution, liquidation or winding up. Each person in whose name any
certificate for shares of Common Stock is to be issued shall for all purposes be
deemed to have become the holder of record of such shares on the date on which
this instrument was surrendered and payment of the Warrant Price was made,
irrespective of the date of delivery of such stock certificate, except that, if
the date of such surrender and payment is a date when the stock transfer books
of the Company are closed, such person shall be deemed to have become the holder
of such shares of Common Stock at the close of business on the next succeeding
date on which the stock transfer books are open.

6.   SUCCESSORS AND ASSIGNS

     The terms and provisions of this Warrant shall inure to the benefit of, and
be binding upon, the Company and the holder thereof and their respective
successors and permitted assigns.

7.   RESTRICTED SECURITIES

     In order to enable the Company to comply with the Securities Act and
applicable state laws, the Company may require the holder as a condition of the
transfer or exercise of this Warrant, to give written assurance satisfactory to
the Company that the Warrant, or in the case of an exercise hereof the shares
subject to this Warrant, are being acquired for his own account, for investment
only, with no view to the distribution of the same, and that any disposition of
all or any portion of this Warrant or the Shares issuable upon the due exercise
of this Warrant shall not be made, unless and until:

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     (a) There is then in effect a registration statement under the Securities
Act covering such proposed disposition and such disposition is made in
accordance with such registration statement; or

     (b)(i) The holder has notified the Company of the proposed disposition and
shall have furnished the Company with a detailed statement of the circumstances
surrounding the proposed disposition, and (ii) the holder has furnished the
Company with an opinion of counsel, reasonably satisfactory to the Company, that
such disposition will not require registration of such securities under the
Securities Act and applicable state law.

     The holder acknowledges that this Warrant is, and each of the shares of
Common Stock issuable upon the due exercise hereof will be, a restricted
security, that he understands the provisions of Rule 144 of the Securities and
Exchange Commission, and that the certificate or certificates evidencing such
shares of Common Stock will bear a legend substantially similar to the
following:

     "The shares represented by this certificate have not been registered under
     the Securities Act of 1933, as amended, or under the securities laws of any
     state. They may not be sold, transferred or otherwise disposed of in the
     absence of an effective registration statement covering these securities
     under the said Act or laws, or an opinion of counsel satisfactory to the
     Company and its counsel that registration is not required thereunder."

8.   LOSS OR MUTILATION

     Upon receipt by the Company of satisfactory evidence of the ownership of
and the loss, theft, destruction, or mutilation of any Warrant, and (i) in the
case of loss, theft, or destruction, upon receipt by the Company of indemnity
satisfactory to it, or (ii) in the case of mutilation, upon receipt of such
Warrant and upon surrender and cancellation of such Warrant, the Company shall
execute and deliver in lieu thereof a new Warrant representing the right to
purchase an equal number of shares of Common Stock.

9.   ACCREDITED INVESTOR

     The Holder hereby represents and warrants that he is an "accredited
investor" as that term is defined in Regulation D promulgated pursuant to the
Securities Act. Holder hereby acknowledges that but for the aforesaid
representation the Company would not issue this Warrant to Holder.

10.  NOTICES

     All notices, requests, demands and other communications under this Warrant
shall be in writing and shall be deemed to have been duly given on the date of
service if served personally on the party to whom notice is to be given, or on
the date of mailing if mailed to the party to whom notice is to be given, by
first class mail, registered or certified, postage prepaid, and properly
addressed as follows: if to the holder, at his address as shown in the Company
records; and if to the Company, at its principal office. Any party may change
its address for purposes of this subsection by giving the other party written
notice of the new address in the manner set forth above.

11.  GOVERNING LAW

     This Warrant and any dispute, disagreement or issue of construction or
interpretation arising hereunder whether relating to its execution, its
validity, the obligations provided herein or performance shall be governed or
interpreted according to the laws of the State of Texas without regard to
conflicts of law.

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     DATED AS OF JANUARY 14, 2000.

                               MSI HOLDINGS, INC.

                               By:
                                   --------------------------------------
                                   ROBERT J. GIBBS, President and CEO

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                                  SUBSCRIPTION

MSI Holdings, Inc.
501 Waller
Austin, Texas  78702

Gentlemen:

The undersigned, TSG Financial Limited Partnership, hereby elects to purchase,
pursuant to the provisions to the foregoing Warrant held by the undersigned,
200,000 (two hundred thousand) shares of the Common Stock, $0.10 par value
("Common Stock"), of MSI Holdings, Inc.

Payment of the purchase price per Share required under such Warrant accompanies
this subscription.

The undersigned hereby represents and warrants that absent an effective
registration statement covering the Warrants, the undersigned is acquiring such
stock for the account of the undersigned and not for resale or with a view to
distribution of such Common Stock or any part hereof; that the undersigned is
fully aware of the transfer restrictions affecting restricted securities under
the pertinent securities laws and the undersigned understands that the shares
purchased hereby are restricted securities and that the certificate or
certificates evidencing the same will bear a legend to that effect.

DATED: JANUARY 14, 2000

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

                                  Address:    TSG Financial Limited Partnership
                                              2700 Via Fortuna, Suite 400
                                              Austin, TX 78746

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                                                                   EXHIBIT 10.76

                                     FORM OF
                        INTEGRATED SECURITY SYSTEMS, INC.
                             SUBSCRIPTION AGREEMENT

Integrated Security Systems, Inc.
8200 Springwood Drive
Suite 230
Irving, Texas  75063

Gentlemen:

         This Subscription Agreement ("Agreement") has been executed by the
undersigned in connection with the private placement of up to 150,000 shares
(the "Shares") of Series D Convertible Preferred Stock, par value $0.01 per
share (the "Preferred Stock"), of Integrated Security Systems, Inc. (the
"Company"). The undersigned hereby makes the following representations,
warranties and agreements:

         1. INFORMATION. The undersigned has received and carefully reviewed the
Company's Confidential Offering Memorandum dated August 1999 (the "Offering
Memorandum"). The Company represents and warrants to the undersigned that from
the date of the Offering Memorandum to the date of acceptance of this Agreement
by the Company, the Offering Memorandum, as such may be supplemented or amended,
will not contain any untrue statement of a material fact or omit to state a
material fact in order to make the statements therein, in light of the
circumstances under which they were made, not misleading. The representations
and warranties herein contained shall survive the execution and delivery of this
Agreement and the sale of the Shares hereunder.

         2. AGREEMENT TO SUBSCRIBE. The undersigned hereby subscribes for
__________ Shares at a price of $20.00 per Share, payment for which in the
amount of $______________________ is made herewith. Payment for such
subscription is being made by check, bank draft or money order.

         The Company may accept or reject any subscription in whole or in part
or otherwise alter the terms under which subscriptions may be accepted. The
Company, its officers, directors, current shareholders and their affiliates may
purchase Shares on the same basis as other subscribers.

         The undersigned understands that except as provided under state
securities laws, this subscription is irrevocable and that the execution and
delivery of this Agreement will not constitute an agreement between the
undersigned and the Company until this Agreement has been accepted by the
Company. No subscription shall be deemed accepted until the subscription has
been accepted and, if necessary, any subsequent acts have been taken which shall
be deemed an acceptance of this Agreement by the Company.

         3. ACCESS TO INFORMATION. The undersigned acknowledges that the
undersigned is subscribing for the Shares after what the undersigned deems to be
adequate investigation of the business and prospects of the Company by the
undersigned. The undersigned has been furnished with the Offering Memorandum and
any other materials relating to the business and operation of the Company that
have been requested by him, her or it and has been given an opportunity to make
any further inquiries desired of the management and any other personnel of the
Company. The undersigned has received complete and satisfactory answers to any
such inquiries.

<PAGE>   2

         4. CERTAIN REPRESENTATIONS. The undersigned represents and warrants
that the information provided in the Accredited Investor Questionnaire submitted
herewith to the Company by or on behalf of the undersigned is true and correct
as of the date hereof. The representations, warranties, agreements, undertakings
and acknowledgments made by the undersigned in this Agreement are made with the
intent that they be relied upon by the Company in determining the undersigned's
suitability as a purchaser of the Shares, and shall survive its purchase. In
addition, the Investor undertakes to notify the Company immediately of any
change in any representation, warranty or other information relating to the
undersigned set forth herein.

                  (a) If the undersigned is a corporation, it is duly organized,
         validly existing and in good standing under the laws of the state and
         country of its incorporation; that the corporation has the corporate
         power to carry on its business and to make the investment contemplated
         herein and that this investment is for a proper corporate purpose; that
         this Agreement has been duly and validly authorized, executed and
         delivered and when accepted by the Company will constitute the valid,
         binding and enforceable agreement of the undersigned; that the
         corporation has not been organized solely for the purpose of acquiring
         the Shares; that the corporation has sufficient liquid assets to pay
         the full acquisition costs in connection with the Shares it proposes to
         acquire; and that the corporation has sufficient assets such that it
         can afford a total loss of its investment in the Shares.

                  (b) If the undersigned is a partnership or association, it has
         not been organized solely for the purpose of acquiring the Shares; that
         each individual partner of the partnership or member of the association
         can bear the economic risks of his, her or its pro rata share of this
         investment and can afford a total loss of his, her or its investment;
         and that each individual partner or member has sufficient liquid assets
         to pay his, her or its portion of the full acquisition costs in
         connection with the Shares the partnership or association has agreed to
         acquire, has adequate means of providing for his, her or its current
         needs and possible personal contingencies, and has no present need for
         liquidity of his, her or its investment.

                  (c) The undersigned has been advised that Offering of the
         Shares is not being registered under the Securities Act of 1933, as
         amended (the "Act"), on the basis of the exemption provided for in Rule
         506 of Regulation D thereof and on the representations made by the
         undersigned herein. The undersigned understands that no federal or
         state agency has passed on or made any recommendation or endorsement of
         the Shares and that the Company is relying on the truth and accuracy of
         the representations, declarations and warranties herein made by the
         undersigned in offering the Shares for sale to the undersigned without
         having first registered the same under the Act.

                  (d) The undersigned is acquiring the Shares for investment for
         the undersigned's own account and not with a view to their resale or
         distribution and does not intend to divide his, her or its
         participation with others or to resell or otherwise dispose of all or
         any part of the Shares unless and until they are subsequently
         registered under the Act, or an exemption from such registration is
         available.

                  (e) The undersigned has the ability to evaluate the merits and
         risks of an investment in the Company based upon his, her or its
         knowledge and experience in financial and business matters.

<PAGE>   3

                  (f) The undersigned understands that, in the view of the
         Securities and Exchange Commission (the "Commission"), the statutory
         exemption referred to above would not be available if, notwithstanding
         the undersigned's representations, the undersigned has in mind merely
         acquiring the Shares for immediate resale or distribution upon a market
         developing therefor.

                  (g) The undersigned further understands that in the event Rule
         144 under the Securities Act ("Rule 144") hereafter becomes applicable
         to the Shares, any routine sale of the Shares made thereunder can be
         made only in limited amounts in accordance with the terms and
         conditions of this Agreement and of Rule 144 and that in the event Rule
         144 is not applicable, compliance with a disclosure exemption will be
         required before the undersigned can transfer part or all of the Shares.

                  (h) The undersigned accepts the condition that before any
         transfer of any of the Shares can be made by the undersigned, written
         approval must first be obtained from the Company's counsel. The basis
         of such approval shall be in compliance with the requirements of the
         federal and state statutes regulating securities. The undersigned
         understands that a legend to this effect will be placed on the Shares
         and that stop-transfer instructions will be issued by the Company to
         its transfer agent.

                  (i) The undersigned understands and agrees that if the
         undersigned's subscription is accepted, the undersigned may be required
         to execute other documents to effectuate or evidence his, her or its
         purchase of the Shares.

                  (j) No one acting on behalf of the Company has made any
         representation, warranty, or agreement to or with the undersigned with
         respect to purchase of the Shares, except as described herein and in
         the Offering Memorandum.

                  (k) The undersigned's investment in the Company has not been
         solicited by means of public solicitation or advertisement and all of
         the information and representations contained herein, particularly
         those representations relating to the undersigned's general ability to
         bear the risks of the investment being made hereby and the
         undersigned's suitability as an investor, are true and correct.

                  (l) The undersigned is aware that the Shares are a speculative
         investment involving a very high degree of risk and that there is no
         guarantee that the undersigned will realize any gain from the
         undersigned's investment. The undersigned is (i) able to bear the
         economic risk of this investment, (ii) able to hold the Shares
         indefinitely, and (iii) presently able to afford a complete loss of
         this investment. The undersigned has consulted the undersigned's own
         attorney, accountant or investment advisor with respect to the
         undersigned's investment in the Shares and its suitability for the
         undersigned.

                  (m) The undersigned has adequate other means of providing for
         the undersigned's current needs and personal contingencies and therefor
         has no need for liquidity in this investment. The undersigned's overall
         commitment to investments that are not readily marketable is not
         disproportionate to the undersigned's net worth and the undersigned's
         investment in the Shares will not cause such overall commitment to
         become excessive.

<PAGE>   4

                  (n) The undersigned represents that the funds provided for
         this investment are either separate property of the undersigned,
         community property over which the undersigned has the right of control
         or are otherwise funds as to which the undersigned has the right of
         management.

                  (o) The undersigned understands the meaning and legal
         consequences of the representations and warranties made herein, all of
         which are true and correct as of the date hereof and will be true and
         correct as of the date of the undersigned's acquisition of the Shares
         subscribed for herein. Each such representation and warranty shall
         survive such purchase.

                  (p) The undersigned is a bona fide resident of the state set
         forth on the signature page hereof, maintains his, her or its principal
         residence there and is at least 21 years of age.

                  (q) The undersigned has relied on his, her or its own legal
         counsel to the extent the undersigned has deemed necessary as to all
         legal matters and questions presented with reference to the offering
         and sale of the Shares subscribed for herein.

                  (r) The undersigned hereby agrees that this subscription is
         irrevocable and that the representations and warranties set forth in
         this Agreement shall survive the acceptance hereof by the Company.

                  (s) The undersigned hereby agrees and acknowledges that the
         agreements and representations herein set forth shall become effective
         and binding upon the undersigned and the undersigned's heirs, legal
         representatives, successors and assigns upon the Company's acceptance
         hereof.

                  (t) The undersigned is an accredited investor as defined in
         Rule 501 of Regulation D under the Act.

                  (u) (For Residents of All States). The undersigned understands
         and agrees to the following:

                           IN MAKING AN INVESTMENT DECISION, INVESTORS MUST RELY
                  ON THEIR OWN EXAMINATION OF THE COMPANY AND THE TERMS OF THE
                  OFFERING, INCLUDING THE MERITS AND RISKS INVOLVED. THESE
                  SECURITIES HAVE NOT BEEN RECOMMENDED BY ANY FEDERAL OR STATE
                  SECURITIES COMMISSION OR REGULATORY AUTHORITY. FURTHERMORE,
                  THE FOREGOING AUTHORITIES HAVE NOT CONFIRMED THE ACCURACY OR
                  DETERMINED THE ADEQUACY OF THIS DOCUMENT. ANY REPRESENTATION
                  TO THE CONTRARY IS A CRIMINAL OFFENSE.

                           THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON
                  TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED OR
                  RESOLD EXCEPT AS PERMITTED UNDER THE SECURITIES ACT OF 1933,
                  AS AMENDED, AND APPLICABLE STATE SECURITIES LAWS, PURSUANT TO
                  REGISTRATION OR EXEMPTION THEREFROM. INVESTORS SHOULD BE AWARE
                  THAT THEY MAY BE REQUIRED TO BEAR THE FINANCIAL RISKS OF THIS
                  INVESTMENT FOR AN INDEFINITE PERIOD OF TIME.

<PAGE>   5

                  (v) (For New York Residents Only). The undersigned understands
         and agrees to the following:

                           THE COMPANY'S PRIVATE OFFERING MEMORANDUM HAS NOT
                  BEEN REVIEWED BY THE ATTORNEY GENERAL OF THE STATE OF NEW YORK
                  PRIOR TO ITS ISSUANCE AND USE. THE ATTORNEY GENERAL OF THE
                  STATE OF NEW YORK HAS NOT PASSED ON OR ENDORSED THE MERITS OF
                  THIS OFFERING. ANY REPRESENTATION TO THE CONTRARY IS UNLAWFUL.

                  (w) (For Texas Residents Only). The undersigned understands
         and agrees to the following:

                           THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE
                  TEXAS SECURITIES ACT AND, IF OFFERED IN TEXAS OR TO TEXAS
                  RESIDENTS, ARE BEING SOLD IN RELIANCE UPON THE EXEMPTION
                  CONTAINED IN SECTION 5 OF SUCH ACT. THEY CANNOT BE RESOLD
                  UNLESS THEY ARE REGISTERED UNDER THE ACT OR UNLESS AN
                  EXEMPTION FROM REGISTRATION IS AVAILABLE.

         5. INDEMNIFICATION. The undersigned recognizes that the offer of the
Shares was made in reliance upon the undersigned's representations, warranties
and the acknowledgments and agreements set forth above. The undersigned agrees
to provide, if requested, any additional information that may reasonably be
required to determine the eligibility of the undersigned to purchase the Shares.
The undersigned hereby agrees to indemnify the Company and its affiliates and
controlling persons and to hold each of them harmless from and against any loss,
damage or liability due to or arising out of a breach of any representation,
warranty or agreement of the undersigned contained in this Agreement or in any
other document provided by the undersigned to the Company in connection with the
undersigned's investment in the Shares. The undersigned hereby agrees to
indemnify the Company and its affiliates and controlling persons and to hold
them harmless against all liabilities, costs or expenses (including reasonable
attorneys' fees) arising as a result of the sale or distribution of the Shares
by the undersigned in violation of the Securities Act or other applicable law or
any misrepresentation or breach by the undersigned with respect to the matters
set forth herein. In addition, the undersigned agrees to indemnify the Company
and its affiliates and controlling persons and to hold them harmless from and
against, any and all loss, damage, liability or expense, including costs and
reasonable attorneys' fees, to which they may be put or which they may incur or
sustain by reason of or in connection with any representation made by the
undersigned with respect to the matters about which representations or
warranties are required by the terms of this Agreement, or any breach of any
such warranties or any failure to fulfill any covenants or agreements set forth
herein or included in and as defined in the Offering Memorandum. Notwithstanding
any provision of this Agreement, the undersigned does not waive any rights
granted to it under applicable securities laws.

         6. GENERAL.

                  (a) All notices or other communications given or made
         hereunder shall be in writing and shall be delivered or mailed by
         registered or certified mail, return receipt requested, postage
         prepaid, to the undersigned at the undersigned's address set forth
         below and to the Company at the address set forth above.

<PAGE>   6

                  (b) Notwithstanding the place where this Agreement may be
         executed by any of the parties hereto, the parties expressly agree that
         all the terms and provisions hereof shall be construed in accordance
         with and governed by the internal laws of the State of Texas, without
         giving effect to conflicts of law.

                  (c) This Agreement constitutes the entire Agreement between
         the parties hereto with respect to the subject matter hereof and may be
         amended only by a writing executed by all parties. The undersigned
         agrees not to transfer or assign this Agreement, or any of his, her or
         its interest herein, without the express written consent of the
         Company.

                  (d) The undersigned agrees that counsel to the Company shall
         not be liable for taking any action pursuant to this Agreement in the
         absence of gross negligence, misfeasance, malfeasance or fraud.

                  (e) The undersigned has enclosed with this Agreement
         appropriate evidence of the authority of the individual executing this
         Agreement to act on its behalf (i.e., if a trust, a copy of the trust
         agreement; if a corporation, certified corporate resolution authorizing
         the signature and a copy of the articles of incorporation; or if a
         partnership, a copy of the partnership agreement).

                  Kindly deliver the certificates for the Shares registered as
follows:

                -------------------------------------------------
                                     (Name)

                -------------------------------------------------
                                (Street and No.)

                -------------------------------------------------
                           (City, State and Zip Code)

                -------------------------------------------------
                (Social Security No. or Federal Employer ID No.)

                -------------------------------------------------
                                 (Date of Birth)

                                         Very truly yours,

                                         ---------------------------------------
                                         (Signature of Subscriber)

Dated:                    , 1999
      --------------------
ACCEPTED AND AGREED:
INTEGRATED SECURITY SYSTEMS, INC.

By:
    ---------------------------------
    Gerald K. Beckmann, President and CEO

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