Exhibit 4.25

                          FINOVA CAPITAL CORPORATION
                            FINOVA BUSINESS CREDIT


                    CONTINUING LIMITED CORPORATE GUARANTY


           FOR  VALUE RECEIVED,  and in consideration  of any  loan or  other
 financial accommodation heretofore or hereafter at any time made or  granted
 to PC DYNAMICS OF  TEXAS. INC. ("Borrower"),  by FINOVA CAPITAL  CORPORATION
 ("Lender"), the undersigned, JH & BC,  INC. ("Guarantor"), hereby agrees  as
 follows:

           1.         Guaranty of  Obligations.   Guarantor  unconditionally,
 absolutely and  irrevocably  guarantees  the full  and  prompt  payment  and
 performance when due, whether by acceleration or otherwise, and at all times
 thereafter, of all  obligations of  Borrower to  Lender, howsoever  created,
 arising or evidenced, whether direct or indirect, absolute or contingent, or
 now or  hereafter existing  or  due or  to  become due,  including,  without
 limitation, under  or in  connection with  that  certain Loan  and  Security
 Agreement of even date, between Borrower  and Lender (the "Loan  Agreement")
 and each of the documents, instruments and agreements executed and delivered
 in connection therewith, as each may  be modified, amended, supplemented  or
 replaced from time  to time  (all such  obligations are  herein referred  to
 collectively as the "Liabilities", and all documents evidencing or  securing
 any of the Liabilities  are herein referred to,  collectively, as the  "Loan
 Documents"). This Limited  Continuing Corporate  Guaranty (this  "Continuing
 Guaranty") is a  guaranty of  payment and performance  when due  and not  of
 collection.

           In the  event of any default by Borrower in making payment of,  or
 default by Borrower  in performance of,  any of  the Liabilities,  Guarantor
 agrees on demand by Lender to pay and perform all of the Liabilities as  are
 then or thereafter become  due and owing  or are to  be performed under  the
 terms of the Loan  Documents. Guarantor further agrees  to pay all  expenses
 (including reasonable  attorneys' fees  and expenses)  paid or  incurred  by
 Lender in endeavoring to collect the  Liabilities, or any part thereof,  and
 in enforcing this Continuing Guaranty.

           2.         Limitation  on Guaranty.    Notwithstanding  any  other
 provision of this Continuing Guaranty, the aggregate liability of  Guarantor
 hereunder shall not exceed One Hundred Thousand Dollars ($100,000.00).

           3.         Continuing Nature  of Guaranty and  Liabilities.   This
 Continuing Guaranty  shall  be  continuing  and  shall  not  be  discharged,
 impaired or affected by:

                  a. the  insolvency of Borrower  or the payment  in full  of
     all of the Liabilities at any time or from time to time;
<PAGE>
                  b. the  power or authority or  lack thereof of Borrower  to
     incur the Liabilities;

                  c. the validity or invalidity of any of the Loan  Documents
     or the documents securing the same;

                  d. the  existence or non-existence of  Borrower as a  legal
     entity;

                  e.  any transfer  by Borrower  of all  or any  part of  any
     collateral in which Lender has been granted a lien or security  interest
     pursuant to the Loan Documents

                  f. any  statute of limitations  affecting the liability  of
     Guarantor under this  Continuing Guaranty or the  Loan Documents or  the
     ability of Lender to  enforce this Continuing Guaranty or any  provision
     of the Loan Documents or the Security Document; or

                  g.  any  right  of  offset,  counterclaim  or  defense   of
     Guarantor, including, without limitation,  those which have been  waived
     by Guarantor pursuant to Paragraph nine (9) hereof.

           4.         Insolvency of Borrower  or Guarantor. Without  limiting
 the generality of any other provision  hereof Guarantor agrees that, in  the
 event of  the dissolution  or insolvency  of Borrower  or Guarantor  or  the
 inability of Borrower  or Guarantor to  pay their respective  debts as  they
 mature, or  an  assignment by  Borrower  or  Guarantor for  the  benefit  of
 creditors, or the institution  of any proceeding by  or against Borrower  or
 Guarantor alleging that Borrower or Guarantor is insolvent or unable to  pay
 their respective  debts  as  they  mature,  Guarantor  will  pay  to  Lender
 forthwith the full amount which would  be payable hereunder by Guarantor  if
 all of the Liabilities were then due and payable, whether or not such  event
 occurs at a time when any of the Liabilities are otherwise due and payable.

           5.         Payment of  the Liabilities.  Any amounts  received  by
 Lender from whatever source on account of the Liabilities may be applied  by
 Lender toward the payment of such of  the Liabilities, and in such order  of
 application, as Lender may from time to time elect, and notwithstanding  any
 payments made by or for the account of Guarantor pursuant to this Continuing
 Guaranty.

           Guarantor  agrees that,  if at any  time all  or any  part of  any
 payment theretofore applied by Lender to  any of the Liabilities is or  must
 be rescinded or  returned by Lender  for any  reason whatsoever  (including,
 without  limitation,  the  insolvency,   bankruptcy  or  reorganization   of
 Borrower), such  Liabilities  shall, for  the  purposes of  this  Continuing
 Guaranty and to  the extent that  such payment is  or must  be rescinded  or
 returned, be  deemed to  have continued  in existence  notwithstanding  such
 application by Lender,  and this Continuing  Guaranty shall  continue to  be
 effective or be reinstated, as the case may be, as to such Liabilities,  all
 as though such application by Lender had not been made.
<PAGE>
           6.         Permitted Actions of Lender.   Lender may from time  to
 time, in its sole  discretion and without notice  to Guarantor, take any  or
 all of the following actions:

                  a.  retain or obtain a security interest  in any assets  of
     Borrower or  any third party  to secure any  of the  Liabilities or  any
     obligations of Guarantor hereunder;

                  b.  retain or obtain the primary or secondary obligation of
     any obligor or obligors, in addition to  Guarantor, with respect to  any
     of the Liabilities;

                  c.  extend or renew for one or more periods (whether or not
     longer  than  the  original  period),  alter  or  exchange  any  of  the
     Liabilities;

                  d.  waive,  ignore   or  forbear  from  taking  action   or
     otherwise exercising any of its default rights or remedies with  respect
     to any default  by Borrower under the Loan Documents;

                  e.  release,   waive  or  compromise   any  obligation   of
     Guarantor  hereunder or  any  obligation  of any  nature  of  any  other
     obligor primarily or  secondarily obligated with respect  to any of  the
     Liabilities;

                  f.  release its security interest in, or surrender, release
     or permit  any substitution  or exchange  for, all  or any  part of  any
     collateral now  or hereafter  securing  any  of  the Liabilities  or any
     obligation  hereunder, or  extend  or  renew for  one  or  more  periods
     (whether or  not longer  than the  original period)  or  release, waive,
     compromise, alter  or exchange  any  obligations of  any nature  of  any
     obligor with respect to any such property; and

                  g.  demand payment or performance of any of the Liabilities
     from Guarantor at any time or from  time to time, whether or not  Lender
     shall have exercised any of its  rights or remedies with respect to  any
     property securing any of the Liabilities or any obligation hereunder  or
     proceeded against any other obligor primarily or secondarily liable  for
     payment or performance of any of the Liabilities.


           7.         Specific Waivers.   Without limiting the generality  of
 any other provision of this Continuing Guaranty. Guarantor hereby  expressly
 waives:

                  a.        notice  of  the  acceptance  by  Lender  of  this
       Continuing Guaranty;

                  b.        notice  of  the  existence,  creation,   payment,
       nonpayment,  performance  or  nonperformance of  all  or  any  of  the
       Liabilities;
<PAGE>
                  c.        presentment,   demand,   notice   of    dishonor,
       protest,  notice of  protest and  all  other notices  whatsoever  with
       respect  to the  payment  or performance  of  the Liabilities  or  the
       amount thereof or any payment or performance by Guarantor hereunder;

                  d.        all diligence in  collection or protection of  or
       realization  upon  the  Liabilities  or  any  thereof  any  obligation
       hereunder or any security for or guaranty of any of the foregoing;

                  e.        any  right to  direct  or affect  the  manner  or
       timing of Lenders enforcement of its rights or remedies;

                  f.        any and all defenses which would otherwise  arise
       upon  the  occurrence  of  any  event  or  contingency  described   in
       Paragraph  1  hereof or  upon  the  taking of  any  action  by  Lender
       permitted hereunder;

                  g.        any   defense,  right   of  set-off,   claim   or
       counterclaim  whatsoever  and any  and  all  other  rights,  benefits,
       protections and  other defenses available to  Guarantor now or at  any
       time hereafter; and

                  h.        all other  principles or  provisions of  law,  if
       any,  that  conflict  with the  terms  of  this  Continuing  Guaranty,
       including, without  limitation, the effect  of any circumstances  that
       may or might constitute a legal or equitable discharge of a  guarantor
       or surety.

           8.           Irrevocability. Guarantor hereby  further waives  all
 rights to  revoke this Continuing Guaranty  at any time,  and all rights  to
 revoke  any  agreement executed  by  Guarantor at  any  time to  secure  the
 payment  and performance of  Guarantor's obligations  under this  Continuing
 Guaranty.

           9.           Statutory Waiver  of  Rights and  Defenses  Regarding
 Election of Remedies. Guarantor waives all  rights and defenses arising  out
 of an election of remedies by Lender, even though that election of remedies,
 such as a nonjudicial foreclosure with respect to security for a  guaranteed
 obligation,  has   destroyed   Guarantor's   rights   of   subrogation   and
 reimbursement against Borrower  by the operation  of any  applicable law  or
 otherwise.

           10.          Subordination. Guarantor hereby subordinates any  and
 all indebtedness of Borrower to Guarantor to the full and prompt payment and
 performance of all of the Liabilities. Guarantor agrees that Lender shall be
 entitled to receive payment of all Liabilities prior to Guarantor's  receipt
 of payment of any amount of  any indebtedness of Borrower to Guarantor.  Any
 payments on such indebtedness to Guarantor, if Lender so requests, shall  be
 collected, enforced  and received  by Guarantor,  in trust,  as trustee  for
 Lender and shall be paid over to  Lender on account of the Liabilities,  but
 without reducing or affecting in any manner the liability of Guarantor under
 the other provisions of this Guaranty.  Lender is authorized and  empowered,
 but not  obligated, in  its discretion,  (a) in  the name  of Guarantor,  to
 collect enforce, and  to submit claims  in respect of,  any indebtedness  of
 Borrower to  Guarantor and  to apply  any amounts  received thereon  to  the
 Liabilities, and (b) to require Guarantor (i) to collect and enforce and  to
 submit claims in respect of, any indebtedness of Borrower to Guarantor,  and
 (ii) to  pay  any  amounts  received on  such  indebtedness  to  Lender  for
 application to the Liabilities.
<PAGE>
           11.          Subrogation. Guarantor will  not exercise any  rights
 which it may acquire by way  of subrogation under this Continuing  Guaranty,
 by any payment  hereunder or otherwise,  until all of  the Liabilities  have
 been paid in full, in cash, and Lender shall have no further obligations  to
 Borrowers under the Loan Documents or otherwise. If any amount shall be paid
 to Guarantor on account of such  subrogation rights at any other time,  such
 amount shall  be held  in trust  for  the benefit  of  Lender and  shall  be
 forthwith paid to  Lender to  be credited  and applied  to the  Liabilities,
 whether matured or unmatured,  in such manner as  Lender shall determine  in
 its sole discretion.

            12.         Assignment of Lenders  Rights. Lender may, from  time
 to time, without notice to Guarantor, assign  or transfer any or all of  the
 Liabilities or any interest therein and, notwithstanding any such assignment
 or transfer  of the  Liabilities or  any subsequent  assignment or  transfer
 thereof the Liabilities shall be and remain the Liabilities for the  purpose
 of this  Continuing  Guaranty.  Each  and  every  immediate  and  successive
 assignee or transferee of any of the Liabilities or of any interest  therein
 shall, to  the  extent of  such  party's  interest in  the  Liabilities,  be
 entitled to the benefits of this  Continuing Guaranty to the same extent  as
 if such assignee or transferee were  Lender; provided, however, that  unless
 Lender shall otherwise consent in writing,  Lender shall have an  unimpaired
 right, prior and  superior to that  of any such  assignee or transferee,  to
 enforce this Continuing  Guaranty for  its own benefit  as to  those of  the
 Liabilities which Lender has not assigned or transferred.

           13.           Indulgences Not  Waivers. No delay  in the  exercise
 of any right or remedy shall operate as  a waiver thereof, and no single  or
 partial exercise by Lender  of any right or  remedy shall preclude other  or
 further exercise thereof or tbe exercise  of any other right or remedy;  nor
 shall any modification or waiver of any of the provisions of this Continuing
 Guaranty be binding upon Lender, except as expressly set forth in a  writing
 duly signed and delivered by Lender. No action of Lender permitted hereunder
 shall in any way affect or impair the rights of Lender or the obligations of
 Guarantor under this Continuing Guaranty

           14.           Financial   Condition    of   Borrower.    Guarantor
 represents and warrants that it is fully aware of the financial condition of
 Borrower, and Guarantor delivers this Continuing Guaranty based solely  upon
 its own independent investigation of  Borrower's financial condition and  in
 no part upon any representation or statement of Lender with respect thereto.
 Guarantor further represents and  warrants that it is  in a position to  and
 hereby  does  assume  full  responsibility  for  obtaining  such  additional
 information concerning Borrowers financial  condition as Guarantor may  deem
 material to its obligations  hereunder, and Guarantor  is not relying  upon,
 nor expecting Lender to  furnish it any  information in Lender's  possession
 concerning Borrower's financial  condition or  concerning any  circumstances
 bearing on  the  existence  or  creation,  or  the  risk  of  nonpayment  or
 nonperformance of the Liabilities.

           Guarantor  hereby  waives  any  duty on  the  part  of  Lender  to
 disclose to Guarantor any facts it may now or hereafter know about Borrower,
 regardless of  whether Lender  has reason  to believe  that any  such  facts
 materially increase the risk beyond that  which Guarantor intends to  assume
 or has reason to believe that such facts are unknown to Guarantor.
<PAGE>
           Guarantor  hereby  knowingly  accepts  the  full  range  of   risk
 encompassed within  a  contract  of "Continuing  Guaranty"  which  includes,
 without  limitation,  the  possibility  that  Borrower  will  contract   for
 additional indebtedness for  which Guarantor may  be liable hereunder  after
 Borrower's financial condition or ability to pay its lawful debts when  they
 fall due has deteriorated.

           15.        Representations  and Warranties.  Guarantor  represents
 and warrants to Lender that each of the following statements is accurate and
 complete as of the date of this Continuing Guaranty:

                  a.        this Continuing  Guaranty has  been duly executed
      and delivered by Guarantor  and constitutes a legal, valid and  binding
      obligation of  Guarantor, enforceable against  Guarantor in  accordance
      with its  terms, except as limited  by bankruptcy, insolvency or  other
      laws of  general application relating to  or affecting the  enforcement
      of creditors' rights generally;

                  b.        the execution, delivery  and performance of  this
       Continuing Guaranty do  not (i) violate any  provisions of law or  any
       order  of   any  court  or  other   agency  of  government  (each,   a
       "Requirement of Law"),  (ii) contravene any provision of any  material
       contract  or agreement  to which  Guarantor  is a  party or  by  which
       Guarantor  or  Guarantor's assets  are  bound  (each,  a  "Contractual
       Obligation"), or  (iii) result in  the creation or  imposition of  any
       lien, .charge  or encumbrance of any  nature upon any property,  asset
       or revenue of Guarantor;

                  c.        all consents, approvals, orders  and  authorizat-
       ions  of,  and  registrations,  declarations  and  filings  with,  any
       governmental  agency  or   authority   or   other  person  or   entity
       (including, without  limitation, the shareholders  or partners of  any
       entity), if any, which are required to be obtained in connection  with
       the  execution  and  delivery  of  this  Continuing  Guaranty  or  the
       performance of Guarantor's  obligations hereunder have been  obtained,
       and each is in full force and effect;

                   d.        Guarantor  has paid all taxes and other  charges
        imposed  by any governmental agency or  authority due and payable  by
        Guarantor  other than those which are being challenged in good  faith
        by appropriate proceedings;

                   e.        Guarantor   is   not   in   violation   of   any
        Requirement   of  Law  or  Contractual  Obligation  other  than   any
        violation  the  consequences  of which  could  not  have  a  material
        adverse  effect on  Guarantor's ability  to perform  its  obligations
        hereunder (a "Material Adverse Effect"); and

                   f.        no   action,   proceeding,   investigation    or
        litigation  is  pending or,  to  the knowledge  of  Grantor,  overtly
        threatened  against  Guarantor by  any  person or  entity  which,  if
        adversely determined, could have a Material Adverse Effect.

           16.           Guarantor  Financial  Information.  Guarantor   will
 provide Lender in writing such financial and other information with  respect
 to Guarantor's assets  and liabilities  as Lender  shall reasonably  request
 from time to time, in form satisfactory, to Lender.
<PAGE>
           17.           Binding Upon  Successors: Death  of Guarantor.  This
 Continuing  Guaranty  shall  be  binding  upon  Guarantor  and   Guarantor's
 successors  and assigns and  shall inure to  the benefit of  Lender and  its
 successors and assigns. This  Continuing Guaranty shall not terminate or  be
 revoked  upon  the death  of  Guarantor, notwithstanding  any  knowledge  by
 Lender of Guarantor's death.

            All references herein to Borrower shall be deemed to include  its
 successors  and assigns, and  all references  herein to  Guarantor shall  be
 deemed to include Guarantor and Guarantor's successors and assigns.

           In  addition   and  notwithstanding  anything   to  the   contrary
 contained in this Continuing Guaranty or  in any other document,  instrument
 or agreement between  or among  any of  Lender, Borrower,  Guarantor or  any
 third party, the obligations  of Guarantor with  respect to the  Liabilities
 shall be joint  and several  with any  other person  or entity  that now  or
 hereafter executes a guaranty of any  of the Liabilities separate from  this
 Continuing Guaranty.

           18.           Notices. All  notices required  or permitted  to  be
 given  hereunder  shall  be  in  writing  and  shall  be  either  personally
 delivered, transmitted by facsimile to the facsimile numbers provided herein
 or sent  by  United States  certified  or registered  mail,  return  receipt
 requested, addressed to  Guarantor or Lender  at their respective  addresses
 stated below or at such other address as either party hereafter notifies the
 other party as  herein provided.  Notices shall  be deemed  received on  the
 earlier of (i) the  date noted on  the return receipt  as delivered if  mail
 delivery of the notice is successful or the date inscribed on a confirmation
 of successful transmission,  if sent  by facsimile;  (ii) the  last date  of
 attempted delivery, as  noted by  the United  States Postal  Service on  the
 envelope containing the notice, if mail  delivery is unsuccessful; or  (iii)
 the date of the actual delivery if personally delivered.

           19.      Governing   Law:  Additional  Waivers:  This   Continuing
 Guaranty has  been delivered  and  shall be  governed  by and  construed  in
 accordance with  the internal  laws  (as opposed  to  the conflicts  of  law
 provisions) of the State of Arizona.

           GUARANTOR HEREBY

              (i)  WAIVES  ANY RIGHT  TO A TRIAL  BY JURY IN  ANY ACTION  TO
       ENFORCE  OR  DEFEND  ANY  MATTER  ARISING  FROM  OR  RELATED  TO  THIS
       CONTINUING  GUARANTY, AND ACKNOWLEDGES  THAT LENDER  ALSO WAIVES  SUCH
       RIGHT;

              (ii) IRREVOCABLY SUBMITS  TO THE JURISDICTION  OF ANY STATE  OR
       FEDERAL COURT LOCATED IN MARICOPA COUNTY, ARIZONA, OVER ANY  ACTION OR
       PROCEEDING TO ENFORCE OR DEFEND ANY MATTER ARISING FROM OR RELATED  TO
       THIS CONTINUING GUARANTY

              (iii) IRREVOCABLY  WAIVES, TO THE FULLEST  EXTENT GUARANTOR MAY
       EFFECTIVELY  DO  SO, THE  DEFENSE  OF  AN INCONVENIENT  FORUM  TO  THE
       MAINTENANCE OF ANY SUCH ACTION OR PROCEEDING;
<PAGE>
              (iv)  agrees that  a  final judgment  in  any  such  action  or
       proceeding  shall be  conclusive  and may  be  enforced in  any  other
       jurisdictions by suit on the judgment or in any other manner  provided
       by law; and

              (v)  agrees  not to institute  any legal action  or  proceeding
       against  Lender or  any of  Lender's directors,  officers,  employees,
       agents or  property concerning any matter  arising out of or  relating
       to this  Continuing Guaranty in  any court other  than one located  in
       Maricopa County, Arizona.

           Nothing herein  shall affect  or impair  Lender's right  to  serve
 legal process in any manner permitted by law or Lender's right to bring  any
 action or proceeding against Guarantor or its property in the courts of  any
 other jurisdiction.  Whenever possible  each  provision of  this  Continuing
 Guaranty shall be interpreted as to be effective and valid under  applicable
 law, but if any provision of this Continuing Guaranty shall be prohibited by
 or invalid under such law, such  provision shall be ineffective only to  the
 extent of such prohibition or invalidity, without invalidating the remainder
 of such provision or the remaining provisions of this Continuing Guaranty.

              20.       ADVICE  OF  COUNSEL.   GUARANTOR  ACKNOWLEDGES   THAT
 GUARANTOR  HAS  EITHER  OBTAINED  THE ADVICE  OF  COUNSEL  OR  HAS  HAD  THE
 OPPORTUNITY  TO  OBTAIN  SUCH  ADVICE  IN  CONNECTION  WITH  THE  TERMS  AND
 PROVISIONS OF THIS CONTINUING GUARANTY.

              21.       Entire Agreement. This  Continuing Guaranty  contains
 the  complete  understanding of  the  parties  hereto with  respect  to  the
 subject matter herein. Guarantor acknowledges that Guarantor is not  relying
 upon  any statements  or representations  of Lender  not contained  in  this
 Continuing  Guaranty and that  such statements or  representations, if  any,
 are  of no  force or  effect and  are fully  superseded by  this  Continuing
 Guaranty.  This  Continuing Guaranty  may  only  be modified  by  a  writing
 executed by Guarantor and Lender.
<PAGE>
           IN  WITNESS  WHEREOF,  Guarantor  has  executed  this   Continuing
 Guaranty this 25th day of March, 1999.



                                JH & BC, Inc.,
                                "Guarantor"

                                By:  /s/
                                     --------------------------
                                     D. Ronald Allen, President
                                     FEIN: 75-2489134
                                     10911 Petal Street, Suite 105
                                     Dallas, Texas 75238
                                     Facsimile:    214-503-8607


 Lender's address for notices:

 FINOVA Capital Corporation
 Attn: David Sands
 355 South Grand Avenue, Suite 2400
 Los Angeles, California 90071

 Facsimile: 213-625-2746