Exhibit 10.19

                 UNLIMITED CONTINUING AND UNCONDITIONAL GUARANTY


     FOR VALUE RECEIVED,  and to induce THE HUNTINGTON  NATIONAL BANK, 685 South
Babcock Street, Melbourne, Florida 32901 (herein called "Lender"), to make loans
or advances or to extend credit or other financial  accommodations  or benefits,
with or without security, to or for the account of SOFTWARE TECHNOLOGY,  INC., a
Florida  corporation,  (herein  called  "Borrower"),  the  undersigned,  EXIGENT
INTERNATIONAL,  INC., a Delaware corporation, hereby jointly and severally agree
as follows.

     1. The  undersigned  hereby  absolutely and  unconditionally  guarantees to
Lender and any transferee of this Guaranty or any Liability  guaranteed  hereby,
the prompt and full payment of the Liabilities.  The undersigned  agrees that if
Borrower fails to fully and timely perform any Liability,  the undersigned  will
fully and timely  perform the  Liability  without  resort by Lender to any other
person.  Any obligation of the undersigned under this Guaranty is in addition to
any and shall not prejudice or be prejudiced by any other  agreement  (including
any other agreement signed by the undersigned) which Lender may now or hereafter
hold relative to any of the  Liabilities.  Any payment of the undersigned  under
this Guaranty may be applied to any of the Liabilities as Lender may choose. Any
obligation  of the  undersigned  to Lender  hereunder  is primary,  absolute and
unconditional.  The terms  "Liability"  or  "Liabilities"  as used herein  shall
include,  without  limitation,  all  liabilities  and obligations of Borrower to
Lender  including,  but not  limited  to, all  liabilities  and  obligations  of
Borrower  arising out of, the  $3,511,111.22  aggregate loan transaction of even
date  herewith,  however and whenever  incurred or evidenced,  whether  primary,
secondary, direct, indirect,  absolute,  contingent, sole, joint or several, due
or to become due, or which may be herein or hereafter contracted or acquired, or
incurred  directly or  indirectly  in respect  thereof,  and all  extensions  or
renewals  thereof and all sums  payable  under or by virtue  thereof  including,
without  limitation,  all amounts of  principal  and  interest  and all expenses
(including  attorneys'  fees  and  costs of  collection  as  specified  therein)
incurred in the  collection  thereof or the  enforcement  of rights  thereunder,
whether  arising in the ordinary  course of business or  otherwise,  and whether
held or to be held by Lender  for its own  account  or as agent for  another  or
others.

     2. The undersigned  waives notice of acceptance of this guaranty and notice
of any  Liability  to which it may  apply,  and waives  presentment,  demand for
payment,  protest,  notice of dishonor or nonpayment of any  Liabilities and any
suit or the taking of other action by Lender  against,  and any other notice to,
any party liable thereon (including the undersigned).



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     3.  Lender  may at any time and from  time to time  without  notice  to the
undersigned (except as required by law), without incurring responsibility to the
undersigned, without impairing, releasing or otherwise affecting the obligations
of the  undersigned in whole or in part and without the endorsement or execution
by the undersigned of any additional consent,  waiver or guaranty (a) change the
manner,  place or terms of payment, and change or extend the time of or renew or
alter, any Liability or installment  thereof, or any security therefor,  and may
loan additional monies or extend additional credit to Borrower,  with or without
security,  thereby  creating  new  Liabilities  the  payment  of which  shall be
guaranteed  hereunder,   and  the  guaranty  herein  made  shall  apply  to  the
Liabilities as so changed,  extended,  renewed,  increased or otherwise altered;
(b) sell, exchange, release,  surrender,  realize upon or otherwise deal with in
any manner  and in any order any  property  at any time  pledged,  mortgaged  or
otherwise encumbered to secure the Liabilities and any offset thereagainst;  (c)
exercise  or refrain  from  exercising  any rights  against  Borrower  or others
(including the  undersigned)  or act or refrain from acting in any other manner;
(d)  settle  or  compromise  any  Liability  or any  security  therefor  and may
subordinate  the  payment  of all or any  part  thereof  to the  payment  of any
Liability  (whether or not due) of Borrower to creditors of Borrower  other than
Lender  and the  undersigned;  and (e) apply any sums  from any  sources  to any
Liability without regard to any Liabilities remaining unpaid.

     4. No invalidity,  irregularity or  unenforceability  of all or any part of
the Liabilities or of any security therefor shall affect, impair or be a defense
to this guaranty,  and this guaranty is a primary and absolute obligation of the
undersigned.

     5.  This  guaranty  is  an  unconditional   and  continuing  one,  and  all
Liabilities  to which it applies or may apply  under the terms  hereof  shall be
conclusively  presumed to have been created in reliance  hereon.  This  guaranty
shall  continue  in full  force and effect  notwithstanding  the death of anyone
liable in any manner for the Liabilities and notwithstanding the sale, transfer,
relinquishment or abandonment of any beneficial  interest therein or thereunder,
or the  dissolution,  death,  incapacity or other  disability of any beneficiary
thereof.

     6. All  notices  provided  to be given to  Lender  herein  shall be sent by
registered  or  certified  mail or  express  delivery  service,  return  receipt
requested, to the address shown in the preamble to this agreement.

     7. As security for the  Liabilities  and the obligation of the  undersigned
under this Guaranty, Lender is hereby given a lien upon, security title to and a
security  interest  in all  property  of  the  undersigned  now  or at any  time
hereafter  in  possession  of Lender in any  capacity  whatsoever,  and  whether
individual, joint or by the entireties, including but not limited to any balance
or share in any deposits,  funds, accounts,  trusts, agency or special accounts,
items, securities,  other property or monies of the undersigned now or hereafter
in the  possession  or control  of or  otherwise  with  Lender,  to include  all
dividends and distributions thereon or other rights in connection therewith, and
Lender  shall have such right to such  property as  authorized  by law.  Without
limiting the  generality of the foregoing,  Lender shall have a prior  perfected
security interest to secure the Liabilities and may, at any time or from time to
time  at its  option  and  without  notice:  (a) set off  against  such  deposit
balances, funds, items, certificates of deposit,  securities, other property and
monies and apply the same towards the payment of any of the Liabilities, and (b)
transfer  into its own name or that of its  nominee  any  such  property  in the
possession or custody of Lender.



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     8. The undersigned  shall be in default  hereunder upon: (a) non-payment of
any Liability when due or before the expiration of applicable grace periods; (b)
failure of Borrower or the  undersigned  to perform  any  agreement  creating or
otherwise  affecting any Liability or any provision  hereof,  or to pay in full,
when due, any other  obligation of Borrower or the  undersigned,  all within and
before the expiration of any applicable  grace period;  (c) the appointment of a
receiver of any part of the property of Borrower or of any material  part of the
property of the  undersigned,  assignment  for the benefit of  creditors  or the
commencement  of any  proceedings in bankruptcy or insolvency by Borrower or the
undersigned  or the failure to timely  contest,  or to secure  dismissal  within
sixty days of filing,  any involuntary  proceeding  seeking the  adjudication of
Borrower or the undersigned as bankrupt or insolvent;  (d) the entry of a final,
unappealable  judgment having a material  adverse affect against Borrower or the
undersigned;  (e)  the  taking  of  possession  of any  substantial  part of the
property of  Borrower or the  undersigned  at the  instance of any  governmental
authority; (f) the insolvency of the undersigned; or (g) falsity in any material
respect of, or any material omission in, any representation or statement made to
Lender by or on behalf of Borrower or the  undersigned  in  connection  with any
Liability or other obligation of such parties.

     9. Upon the occurrence of any default  hereunder,  Lender shall have all of
the remedies of a creditor  and to the extent  applicable,  of a secured  party,
under all applicable law, and, without limiting the generality of the foregoing,
Lender  may,  at its  option  and  without  notice or demand:  (a)  declare  any
Liability  accelerated  and due and payable at once, and (b) take  possession of
any collateral security wherever located, and sell, resell, assign, transfer and
deliver all or any part of said  property of  Borrower or the  undersigned,  for
cash or on credit or for  future  delivery,  and,  upon any such  sale,  Lender,
unless prohibited by law the provisions of which cannot be waived,  may purchase
all or any part of said  property to be sold,  free from and  discharged  of all
trusts, claims, right of redemption and equities of the undersigned  whatsoever;
and (c) set off  against  any or all  Liabilities  or other  obligations  of the
undersigned all money owed by Lender in any capacity to the undersigned  whether
or not due,  and also set off  against  all other  Liabilities  of  Borrower  or
obligations  of the  undersigned  to  Lender  all  money  owed by  Lender in any
capacity  to  Borrower or the  undersigned,  and Lender  shall be deemed to have
exercised such right of set-off and to have made a charge against any such money
immediately  upon the occurrence of such default although made or entered on the
books  subsequent  thereto.  Until all of the  obligations of Borrower to Lender
have been paid and  performed in full,  the  undersigned  shall have no right of
subrogation  to the rights and  remedies  of Lender  against  Borrower,  and the
undersigned  hereby waive any rights to enforce any remedy which Lender may have
against  Borrower  and  any  rights  to  participate  in any  security  for  any
indebtedness hereby guaranteed.



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     10.  The  undersigned  shall pay all  costs of  collection  and  reasonable
attorneys' fees,  including  reasonable  attorneys' fees before, after or during
suit and out of  court,  in trial,  on  appeal,  in  bankruptcy  proceedings  or
otherwise,  incurred or paid by Lender in enforcing the payment of any Liability
or enforcing or preserving any right or interest of Lender,  with respect to the
Liabilities or this Guaranty,  including the collection, sale or delivery of any
collateral  security from time to time pledged,  and after  deducting such fees,
costs and expenses from the proceeds of sale or collection, Lender may apply any
residue to pay any of the Liabilities  and the undersigned  shall continue to be
liable for any deficiency with interest, which shall remain a Liability.

     11. If claim is ever made upon  Lender for  repayment  or  recovery  of any
amount or  amounts  received  by Lender in  payment  or on account of any of the
Liabilities  and  Lender  repays  all or part of said  amount  by  reason of any
judgment,   decree  or  order  of  any  court  or  administrative   body  having
jurisdiction  over Lender or any of its property or any settlement or compromise
of any  such  claim  effected  by  Lender  with  any  such  claimant  (including
Borrower),  then the undersigned agrees that any such judgment,  decree,  order,
settlement or compromise shall be binding upon the undersigned,  notwithstanding
any revocation or  cancellation of any note or other  instrument  evidencing any
Liability,  and the undersigned  shall be and remain liable to Lender  hereunder
for the amount so repaid or  recovered  to the same extent as if such amount had
never originally been received by Lender.

     12.  Lender shall not be bound to take any steps  necessary to preserve any
rights in any of the property of the  undersigned  against prior parties who may
be liable in connection therewith, and the undersigned hereby agrees to take any
such steps. Lender may nevertheless at any time after and during the continuance
of a  default  (a)  take any  action  it may  deem  appropriate  for the care or
preservation  of such  property  or of any rights of the  undersigned  or Lender
therein  (b)  demand,  sue for,  collect or receive any money or property at any
time due, payable or receivable on account of or in exchange for any property of
the  undersigned;  (c)  compromise  and settle  with any  person  liable on such
property,  or (d)  extend  the time of  payment  or  otherwise  change the terms
thereof as to any party liable thereon, all without notice to, without incurring
responsibility  to,  and  without  affecting  any  of  the  obligations  of  the
undersigned.

     13. No delay on the part of Lender in exercising any of its options, powers
or rights,  or partial or single  exercise  thereof,  shall  constitute a waiver
thereof.  No waiver  of any of its  rights  hereunder,  and no  modification  or
amendment of this guaranty, shall be deemed to be made by Lender unless the same
shall be in  writing,  duly  signed on  behalf  of  Lender by a duly  authorized
officer of Lender,  and each such waiver,  if any, shall apply only with respect
to the  specific  instance  involved,  and shall in no way  impair the rights of
Lender or the  obligations of the  undersigned to Lender in any other respect at
any other time.

     14. Lender shall not be required to proceed first against Borrower,  or any
other person, firm, partnership or corporation, whether primarily or secondarily
liable,  or against any collateral  security held by it, before resorting to the
undersigned for payment,  and the undersigned shall not be entitled to assert as
a defense to the  enforceability of the guaranty set forth herein any defense of
Borrower with respect to any Liability.



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     15. Any and all rights and claims of the  undersigned  against  Borrower or
any of Borrower's  property shall be subordinate and subject in right of payment
to the  prior  payment  in  full  of all  Liabilities.  The  undersigned  hereby
subordinates  any and all  indebtedness of Borrower now or hereafter owed to the
undersigned to all  indebtedness  of Borrower to Lender,  and agrees with Lender
that the  undersigned  shall not demand or accept any  payment of  principal  or
interest from Borrower,  shall not claim any offset or other reduction of any of
the  undersigned's  obligations  hereunder  because of any such indebtedness and
shall  not take any  action  to  obtain  any of the  security  described  in and
encumbered  by  the  security  instruments  securing  any  of  the  Liabilities;
provided,  however,  that,  if Lender so requests,  such  indebtedness  shall be
collected, enforced and received by the undersigned as trustee for Lender and be
paid over to Lender on account of the  indebtedness  of Borrower to Lender,  but
without  reducing or  affecting in any manner the  liability of the  undersigned
under the other provisions of this Guaranty.

     16. The  undersigned  warrants and  represents to Lender that all financial
statements  heretofore  delivered  by the  undersigned  to  Lender  are true and
correct in all respects as of the date hereof.

     17. At the request of Lender,  the  undersigned  shall,  from time to time,
prepare and deliver to Lender a complete and current financial statement setting
forth  all  the  assets  and  liabilities  of  the  undersigned,  signed  by the
undersigned under oath as being true and correct.

     18.  This  Guaranty  may not be changed  orally or by  implication,  and no
obligation of the undersigned can be released or waived by Lender or any officer
or agent of Lender, except by a writing,  signed by a duly authorized officer of
Lender.  This  Guaranty  shall  be  irrevocable  by the  undersigned  until  all
indebtedness   guaranteed   hereby  has  been  completely  repaid  and  all  the
Liabilities,  including but not limited to the obligations  and  undertakings of
Borrower  under,  by  reason  of,  or  pursuant  to the note and loan  documents
executed  contemporaneously  herewith,  have been completely paid, performed and
discharged.

     19. If from any circumstances  whatsoever  fulfillment of any provisions of
this Guaranty,  at the time  performance  of such provision  shall be due, shall
involve  transcending  the limit of validity  prescribed by any applicable usury
statute  or any  other  applicable  law as of the date  hereof,  with  regard to
obligations of like  character and amount,  then ipso facto the obligation to be
fulfilled  shall be reduced to the limit of such  validity,  so that in no event
shall any  exaction be  possible  under this  Guaranty  that is in excess of the
limit of such  validity  as of the date  hereof,  but such  obligation  shall be
fulfilled to the limit of such validity.  The provisions of this paragraph shall
control over every other provision of this Guaranty.

     20. This Guaranty is binding upon the  undersigned,  and its successors and
assigns, and shall inure to the benefit of Lender, its successors, endorsees and
assigns.



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     21. This  Guaranty has been  delivered in the State of Florida and shall be
construed  in  accordance  with the laws of  Florida.  Wherever  possible,  each
provision  of  this  Guaranty  shall  be  interpreted  in such  manner  as to be
effective and valid under  applicable law, but if any provision of this Guaranty
shall be prohibited by or invalid under  applicable law, such provision shall be
ineffective  to  the  extent  of  such   prohibition   or  invalidity,   without
invalidating the remainder of such provision or the remaining provisions of this
Guaranty.  To the extent  permitted by applicable  law, the  undersigned  hereby
waives any  provision of law that renders any  provision  hereof  prohibited  or
unenforceable in any respect.

     22. THE  UNDERSIGNED  HEREBY  CONSENTS  AND  AGREES  THAT,  IN ANY  ACTIONS
PREDICATED  UPON  THIS  GUARANTY,  VENUE IS  PROPERLY  LAID IN  BREVARD  COUNTY,
FLORIDA, AND THAT THE CIRCUIT COURT FOR BREVARD COUNTY,  FLORIDA SHALL HAVE FULL
JURISDICTION  TO DETERMINE ALL ISSUES  ARISING OUT OF OR IN CONNECTION  WITH THE
EXECUTION  AND  ENFORCEMENT  OF THIS  GUARANTY OR THE  COLLECTION  OF ANY OF THE
LIABILITIES.  THE  UNDERSIGNED  WAIVE TO THE FULLEST EXTENT  PERMITTED UNDER THE
LAWS OF THE STATE OF FLORIDA,  ANY RIGHT,  POWER OR  PRIVILEGE  TO DEMAND A JURY
TRIAL WITH RESPECT TO ANY AND ALL ISSUES  ARISING OUT OF OR IN  CONNECTION  WITH
THE EXECUTION  AND/OR  ENFORCEMENT  OF THIS GUARANTY OR THE COLLECTION OF ANY OF
THE LIABILITIES.

     Dated as of December 31, 1998.

                                                    EXIGENT INTERNATIONAL, INC.,
                                                     a Delaware Corporation


                                                     By: /s/ Jeffery B. Weinress
                                                        ------------------------
                                                        JEFFERY B. WEINRESS, CFO

                                              Tax Identification No.: 59-3379927