Document:

Exhibit 10.78

                               SECURITY AGREEMENT

         THIS SECURITY  AGREEMENT  (this  "Agreement") is entered into this 16th
day of June,  1999,  by and between APS  Consulting,  Inc., a Texas  corporation
("Debtor"), whose address is 1301 Capital of Texas Highway, Suite C-100, Austin,
Texas 78746, and APSC, Inc., a Delaware  corporation  ("Secured  Party"),  whose
address is 1301 Capital of Texas Highway, Suite C-300, Austin, Texas 78746, who,
for good and valuable consideration, agree as follows:

                                    ARTICLE I

                             AGREEMENT; INDEBTEDNESS

         1.1  SECURITY  INTEREST.  Subject  to  the  applicable  terms  of  this
Agreement,  for good and valuable consideration,  the receipt and sufficiency of
which Debtor  acknowledges,  Debtor assigns and transfers to Secured Party,  and
grants to Secured  Party a continuing  security  interest in and lien upon,  the
Collateral  (as  defined  in Article  II below) to secure  the  payment  and the
performance of the Indebtedness (the "Security Interest").

         1.2      INDEBTEDNESS.  The following  indebtedness  and obligations
(the  "Indebtedness")  are secured by this Agreement:

                  (a) All debt,  obligations,  liabilities,  and  agreements  of
         Debtor to Secured Party,  now or hereafter  existing,  arising directly
         between Debtor and Secured Party or acquired  outright,  conditionally,
         or as collateral  security from another by Secured  Party,  absolute or
         contingent,  joint or several,  secured or  unsecured,  due or not due,
         contractual  or  tortious,  liquidated  or  unliquidated,   arising  by
         operation  of  law  or  otherwise,  including  without  limitation  the
         Promissory  Note (Line of Credit),  dated June 16, 1999, in the maximum
         original  principal  amount  of  $500,000  (subject  to other  ceilings
         provided  therein),  executed  by Debtor,  and  payable to the order of
         Secured  Party,  and  all  renewals,  extensions,   modifications,   or
         rearrangements of any of the foregoing.

                  (b) All costs  incurred by Secured Party to obtain,  preserve,
         perfect,  and enforce  this  Agreement  and the Security  Interest,  to
         collect the  Indebtedness,  and to  maintain,  preserve,  collect,  and
         enforce   the   Collateral,   including   but  not  limited  to  taxes,
         assessments,  insurance premiums,  repairs,  reasonable attorney's fees
         and legal expenses, feed, rent, storage costs, and expenses of sale.

                  (c) Interest on the above  amounts as agreed  between  Secured
         Party and Debtor,  or if there is no agreement,  at the highest  lawful
         rate.

                                   ARTICLE II

                                   COLLATERAL

         2.1      DESCRIPTION   OF   COLLATERAL.   The  Security   Interest  is
granted  in  the  following   (the "Collateral"):

                  (a) All of Debtor's assets,  including without  limitation all
         accounts,   chattel  paper,  contract  rights,  equipment,   inventory,
         fixtures,  general  intangibles,   and  investment  property,  as  more
         particularly  described  in Exhibit "A"  attached  to and  incorporated
         herein by reference.

<PAGE>

                  (b)  All  substitutes  and   replacements   for,   accessions,
         attachments and other additions to, tools,  parts and equipment used in
         connection  with,  and proceeds  and products of, the above  Collateral
         (including  all income and benefits  resulting  from any of the above),
         all certificates of title,  manufacturer's  statements of origin, other
         documents,  accounts,  and chattel paper arising from or related to the
         above Collateral, and returned or repossessed Collateral, any of which,
         if received by Debtor, shall be delivered immediately to Secured Party.

                  (c)      All policies of insurance covering the Collateral and
         proceeds thereof.

                  (d) All security for the payment of any of the Collateral, and
         all goods which gave or will give rise to any of the  Collateral or are
         evidenced, identified, or represented therein or thereby.

                  (e) All property  similar to the property  described above and
         any   other   collateral   fitting   within   any  of   the   foregoing
         classifications hereafter acquired by Debtor.

                  (f)      All  products  and proceeds of the items  described
in  subsections  (a) through (e) of this Section 2.1.

         2.2 AFTER ACQUIRED  CONSUMER GOODS. The Security  Interest shall attach
to after  acquired  consumer  goods  only to the  extent  permitted  by  Section
9.204(b) of the Texas Business and Commerce Code (Texas UCC).

                                   ARTICLE III

                               DEBTOR'S WARRANTIES

         Debtor represents and warrants to Secured Party as follows:

         3.1  FINANCING   STATEMENTS.   No  financing   statement  covering  the
Collateral  is or will be on file in any public  office,  except  the  financing
statements  relating to this Security  Interest,  and those described in Exhibit
"B". In the past five (5) years,  Debtor has not used or done business under any
name other than  "Eco-Acquisition,  Inc.,"  "Eco-Systems"  or its legal name set
forth on the first page of this Agreement.

         3.2 OWNERSHIP.  Debtor owns the Collateral free from any setoff, claim,
restriction,  lien, security interest, or encumbrance except liens for taxes not
yet due, the Security Interest and those described in Exhibit "B".

         3.3 FIXTURES AND ACCESSIONS.  None of the Collateral is affixed to real
estate or is an accession to any goods,  or will become a fixture or  accession,
except as expressly set out herein.

         3.4 CLAIMS OF  DEBTORS ON  COLLATERAL.  No  account  debtors  and other
obligors whose debts or obligations are part of the Collateral have any right to
setoffs, counterclaims, or adjustments, or any defenses in connection therewith.

         3.5      ACCURACY  OF  FINANCIAL  STATEMENTS.  All representations  and
warranties  made by Debtor  with respect to its financial data are true in all
material respects.

         3.6      POWER AND AUTHORITY.  Debtor has full power and authority to
make this Agreement.

<PAGE>

         3.7 PRINCIPAL PLACE OF BUSINESS.  Debtor's  principal place of business
is located  at 4294  Lakeland  Drive,  Suite 200,  Jackson,  Mississippi  39208.
Debtor's chief executive  office is at Debtor's  address stated above in Austin,
Travis County,  Texas, and such address is also where Debtor keeps its books and
records.

         3.8 LOCATION OF COLLATERAL.  All of Debtor's inventory and equipment is
located at the real  properties  described  in Exhibit "C"  attached  hereto and
incorporated  herein by reference or at its principal place of business.  Debtor
has exclusive  possession  and control of its inventory and  equipment.  None of
Debtor's  inventory  or  equipment is evidenced by a document (as defined in the
Texas UCC). All  instruments,  chattel paper,  securities,  and  certificates of
title  comprising  any part of the  Collateral  have been  delivered  to Secured
Party. Before Debtor shall acquire additional inventory and equipment subject to
this  Agreement and store or use such property at a location other than the real
properties  described in Exhibit "C" or remove existing  inventory and equipment
to a location other than the real  properties  described in Exhibit "C",  Debtor
shall first notify Lender of such location and comply with Section 4.7 hereof.

         3.9  PERFECTION.  Upon the filing of the UCC financing  statements with
the (i) Office of the Texas  Secretary  of State;  (ii)  Office of the  Arkansas
Secretary of State;  (iii) Office of the Alabama Secretary of State; (iv) Office
of the  Mississippi  Secretary  of State;  (v) the Office of the County Clerk of
Harris  County,  Texas;  (vi) the Office of the County  Clerk of Pulaski  County
Arkansas; (vii) the Office of the County Clerk of Baldwin County Alabama; (viii)
the Office of the County Clerk of Rankin County,  Mississippi;  and upon Secured
Party's obtaining  possession of all Debtor's  documents,  instruments,  chattel
paper, securities, and certificates of title, and upon Secured Party's obtaining
control of Debtor's Investment Property, the Security Interest will constitute a
valid and perfected lien upon and security  interest in the  Collateral.  In the
event another  secured party has  possession of Debtor's  assets for  perfection
purposes,  such secured party's  possession shall be deemed possession on behalf
of Secured Party to the extent of Secured Party's subordinate security interest,
and when possession is no longer required for any other security interest,  then
possession shall be transferred to Secured Party.

         3.10 SOLVENCY.  As of the date hereof,  and after giving effect to this
Agreement and the completion of all other transactions contemplated by Debtor at
the time of the execution of this Agreement,  (i) Debtor is and will be solvent,
(ii) the fair  saleable  value of Debtor's  assets  exceeds and will continue to
exceed Debtor's liabilities (both fixed and contingent),  (iii) Debtor is paying
and will continue to be able to pay its debts as they mature, and (iv) if Debtor
is not an individual,  Debtor has and will have  sufficient  capital to carry on
Debtor's businesses and all businesses in which Debtor is about to engage.

                                   ARTICLE IV

                               DEBTOR'S COVENANTS

         Debtor covenants and agrees that:

         4.1      INDEBTEDNESS  AND THIS  AGREEMENT.  Debtor  shall pay the
Indebtedness  in  accordance  with its terms and shall promptly  perform all of
his (or its)  agreements  herein and in any other  agreements  between him
(or it) and Secured Party.

         4.2 OWNERSHIP OF COLLATERAL. At the time Debtor grants to Secured Party
a security  interest  in any  Collateral,  Debtor  shall be the  absolute  owner
thereof and shall have the right to grant such security  interest.  Debtor shall
defend the Collateral  against all claims and demands of all persons at any time
claiming any interest  therein  adverse to Secured Party.  Debtor shall keep the
Collateral free from all liens and security interests.

<PAGE>

         4.3  INSURANCE.  Debtor  shall  insure the  Collateral  with  companies
acceptable  to Secured  Party  against  such  casualties  and in such amounts as
Secured Party shall  require.  All insurance  policies  shall be written for the
benefit of Debtor and Secured Party as their  interests may appear,  or in other
form satisfactory to Secured Party, and such policies or certificates evidencing
the same shall be furnished to Secured  Party.  All policies of insurance  shall
provide  for  written  notice  to  Secured  Party  at  least  10 days  prior  to
cancellation. Risk of loss or damage is Debtor's to the extent of any deficiency
in any  effective  insurance  coverage.  Secured  Party  is  appointed  Debtor's
attorney-in-fact  to collect any return or unearned  premiums or the proceeds of
such insurance and to endorse any draft or check payable to Debtor therefor.

         4.4      MAINTENANCE.  Debtor shall keep and maintain the Collateral in
good  condition,  reasonable  wear and tear excepted.

         4.5 SECURED  PARTY'S  COSTS.  Debtor  shall pay all costs  necessary to
obtain, preserve,  perfect, defend, and enforce this Security Interest,  collect
the Indebtedness,  and preserve,  defend,  enforce,  and collect the Collateral,
including but not limited to taxes,  assessments,  insurance premiums,  repairs,
reasonable  attorney's fees and legal expenses,  feed, rent,  storage costs, and
expenses  of  sales.  Whether  Collateral  is  or  is  not  in  Secured  Party's
possession,  and without any  obligation to do so and without  waiving  Debtor's
default for failure to make any such  payment,  Secured  Party at its option may
pay any such costs and expenses,  discharge encumbrances on the Collateral,  and
pay for  insurance  of  Collateral,  and  such  payment  shall  be a part of the
Indebtedness.  Debtor agrees to reimburse  Secured Party on demand for any costs
so incurred.

         4.6 INFORMATION AND INSPECTION.  Debtor shall (i) furnish Secured Party
any financial statements of Debtor or reports to Debtor by accountants or others
pertaining to Debtor's  business as soon as available,  and any information with
respect to the  Collateral  reasonably  requested by Secured  Party;  (ii) allow
Secured Party to inspect the  Collateral,  at any  reasonable  time and wherever
located,  and to inspect and copy, or furnish  Secured Party with copies of, all
records relating to the Collateral and the  Indebtedness;  (iii) furnish Secured
Party such  information  as Secured  Party may  reasonably  request to  identify
inventory,  accounts, and general intangibles in Collateral,  at the time and in
the form  requested by Secured  Party;  and (iv) deliver upon request to Secured
Party  shipping  and  delivery  receipts  evidencing  the  shipment of goods and
invoices   evidencing  the  receipt  of,  and  the  payment  for,  inventory  in
Collateral.

         4.7  ADDITIONAL  DOCUMENTS.  Debtor shall sign any papers  furnished by
Secured Party which are necessary in the reasonable judgment of Secured Party to
obtain,  maintain, and perfect the Security Interest and to enable Secured Party
to comply  with the  Federal  Assignment  of Claims Act or any other  federal or
state law in order to obtain or perfect Secured  Party's  interest in collateral
or to obtain proceeds of collateral.

         4.8 PARTIES LIABLE ON COLLATERAL. Debtor will preserve the liability of
all  obligors on any  Collateral,  will  preserve  the  priority of all security
therefor,  and will deliver to Secured Party the original  certificates of title
on all motor vehicles  included in the  Collateral.  Secured Party shall have no
duty to preserve  such  liability or  security,  but may do so at the expense of
Debtor, without waiving Debtor's default.

         4.9 MODIFICATION OF COLLATERAL.  Without the written consent of Secured
Party, which consent shall not be unreasonably withheld,  Debtor shall not agree
to any  modification  of any of the terms of any  accounts,  contracts,  chattel
paper, general intangibles, or instruments constituting part of the Collateral.

<PAGE>

         4.10 RIGHT OF SECURED PARTY TO NOTIFY  DEBTORS.  During the continuance
of an Event of Default under this  Agreement,  Secured Party may notify  persons
obligated  on any  Collateral  to make  payments  directly to Secured  Party and
Secured Party may take control of all proceeds of any Collateral.  Until Secured
Party elects to exercise such rights,  Debtor, as agent of Secured Party,  shall
collect and enforce all payments owed on Collateral.

         4.11 DELIVERY OF RECEIPTS OF SECURED PARTY;  Rejected Goods. During the
continuance of an Event of Default under this  Agreement,  upon Secured  Party's
demand,  Debtor shall deposit,  upon receipt and in the form received,  with any
necessary  endorsement,  all payments  received as proceeds of Collateral,  in a
special  bank  account in a bank of Secured  Party's  choice over which  Secured
Party  alone shall have power of  withdrawal.  The funds in said  account  shall
secure the Indebtedness.  Secured Party is authorized to make any endorsement in
Debtor's name and behalf. Pending such deposit, Debtor shall not mingle any such
payments  with any of  Debtor's  other  funds or  property,  but will  hold them
separate and upon an express  trust for Secured  Party.  Secured  Party may from
time to time  apply the whole or any part of the  funds in the  special  account
against the  Indebtedness.  Unless Secured Party notifies Debtor in writing that
it dispenses with any one or more of the following requirements, Debtor shall:

                  (a)     inform  Secured  Party  immediately  of the  rejection
of goods,  delay in  delivery or performance, or claim made, in regard to any
Collateral;

                  (b)  keep  returned  goods   segregated  from  Debtor's  other
         property,  and hold the goods as trustee for Secured Party until it has
         paid Secured  Party the amount  loaned  against the related  account or
         chattel paper and deliver the goods on demand to Secured Party; and

                  (c) pay  Secured  Party the  unpaid  amount of any  account in
         Collateral  (i) if the account is not paid when due;  (ii) if purchaser
         rejects  the goods or  services  covered  by the  account;  or (iii) if
         Secured  Party shall at any time reject the account as  unsatisfactory.
         Secured Party may retain the account in  Collateral.  Secured Party may
         charge any deposit amount of Debtor with any such amounts.

         4.12 RECORDS OF COLLATERAL.  Debtor at all times will maintain accurate
books and records  covering the  Collateral.  Debtor  immediately  will mark all
books and records with an entry showing the absolute  assignment of all accounts
in  Collateral  to Secured  Party and Secured Party is hereby given the right to
audit the books and  records of Debtor  relating to  Collateral  at any time and
from time to time.  The amounts shown as owed to Debtor on Debtor's books and on
any assignment schedule will be the undisputed amounts owing and unpaid.  Debtor
shall  disclose  to  Secured  Party  all   agreements   modifying  any  account,
instrument, or chattel paper.

         4.13 DISPOSITION OF COLLATERAL.  If disposition of any Collateral gives
rise to an account,  chattel paper,  or  instrument,  Debtor  immediately  shall
notify Secured Party,  and upon request of Secured Party shall assign or endorse
the same to Secured  Party.  No Collateral  may be sold,  leased,  manufactured,
processed,  or otherwise  disposed of by Debtor in any manner  without the prior
written consent of Secured Party,  except inventory sold,  leased  manufactured,
processed, or consumed in the ordinary course of business.

         4.14  ACCOUNTS   RECEIVABLE.   Each  account  receivable   constituting
Collateral will represent the valid and legally enforceable  obligation of third
parties and shall not be evidenced by any  instrument or chattel  paper.  In the
event any account  shall give rise to any  instrument or chattel  paper,  Debtor
shall  immediately  endorse the same to Secured  Party and deliver all  original
such instruments and chattel paper to Secured Party.

<PAGE>

         4.15  LOCATION OF ACCOUNTS  AND  INVENTORY.  Debtor  shall give Secured
Party  written  notice  of each  office of  Debtor  in which  records  of Debtor
pertaining  to  accounts  in  Collateral  are kept,  and each  location at which
inventory  in  Collateral  is or will be  kept,  and of any  change  of any such
location.  If no such  notice is given,  all  records  of Debtor  pertaining  to
accounts  and all  inventory  are and shall be kept at  Debtor's  address  shown
above.

         4.16 NOTICE OF CHANGES. Debtor will notify Secured Party immediately of
any  material  change in the  Collateral,  of a change in Debtor's  residence or
location,  of a change in any matter  warranted or represented by Debtor in this
Agreement or furnished to Secured Party, and of any Event of Default.

         4.17 USE AND REMOVAL OF COLLATERAL.  Debtor will not use the Collateral
illegally.  Debtor will not permit any of the  Collateral to be removed from the
locations  specified herein or between  locations without the written consent of
Secured Party.

         4.18  POSSESSION OF  COLLATERAL.  If the  Collateral is chattel  paper,
documents,  instruments, or investment securities or other instruments,  Secured
Party may deliver a copy of this Agreement to the broker or seller  thereof,  or
any person in possession  thereof,  and such delivery shall constitute notice to
such person of Secured Party's  security  interest  therein and shall constitute
Debtor's  instruction to such person to deliver to Secured Party certificates or
other  evidence  of the  same as soon as  available.  Debtor  will  deliver  all
investment securities, other instruments, documents, and chattel paper which are
part  of the  Collateral  and  in  Debtor's  possession  to  the  Secured  Party
immediately,  or  if  hereafter  acquired,  immediately  following  acquisition,
appropriately  endorsed to Secured Party's order, or with appropriate,  executed
powers. Debtor waives presentment,  demand, notice of dishonor, protest, and all
other notices with respect thereto.

         4.19     CHATTEL  PAPER.  Debtor has perfected or will perfect a
security  interest by means  satisfactory to Secured Party in goods covered by
chattel paper in Collateral.

         4.20  CONSUMER   CREDIT.   If  any  Collateral  or  proceeds   includes
obligations  of third  parties to Debtor,  the  transactions  giving rise to the
Collateral  shall  conform in all  respects to the  applicable  state or federal
consumer  credit law.  DEBTOR SHALL HOLD  HARMLESS AND  INDEMNIFY  SECURED PARTY
AGAINST ANY COST,  LOSS,  OR EXPENSE  INCLUDING  ATTORNEY'S  FEES,  ARISING FROM
DEBTOR'S BREACH OF THIS COVENANT.

         4.21 CHANGE OF NAME.  Debtor  shall not change its name (or any assumed
name or other name under which Debtor does business) or its corporate  structure
unless at least  thirty (30) days prior to the  effective  date of any such name
change,  Debtor gives Secured Party written  notice of such intended name change
and the new name or any  change  in its  corporate  structure.  Debtor  will not
change its principal  place of business,  chief executive  office,  or the place
where it keeps its books and records  unless Debtor (i) shall have given Secured
Party thirty (30) days prior written notice  thereof,  and (ii) shall have taken
all action deemed  necessary or desirable by Secured Party to cause the Security
Interest  to be  and  remain  perfected  with  the  priority  required  by  this
Agreement.  Debtor shall execute all such  documents and  agreements  (including
without limitation security agreements,  financing statements, and amendments to
financing statements) as Secured Party may reasonably request in connection with
any such name change.

         4.22     NOTATION  ON TITLE  CERTIFICATES.  If  certificates  of title
are  issued  or  outstanding  with respect to any of the Collateral, Debtor will
cause the Security Interest to be properly noted therein.

         4.23 POWER OF  ATTORNEY.  Debtor  appoints  Secured  Party as  Debtor's
attorney-in-fact  with full  power in  Debtor's  name and behalf to do every act
which  Debtor is obligated  to do or may be required to

<PAGE>

do  hereunder;  however,  nothing in this section shall be construed to obligate
Secured Party to take any action hereunder.

         4.24 DEBTOR'S WAIVERS.  Except as otherwise  provided in this Agreement
or by law, Debtor waives notice of the creation,  advance, increase,  existence,
extension,   or  renewal  of,  and  of  any  indulgence  with  respect  to,  the
Indebtedness;  waives notice of intent to  accelerate,  notice of  acceleration,
notice  of intent to  demand,  presentment,  demand,  notice  of  dishonor,  and
protest;  waives  notice of the amount of the  Indebtedness  outstanding  at any
time,  notice of any change in financial  condition of any person liable for the
Indebtedness  or  any  part  thereof,  and  all  other  notices  respecting  the
Indebtedness;  and agrees that maturity of the Indebtedness and any part thereof
may be accelerated,  extended,  or renewed one or more times by Secured Party in
its discretion, without notice to Debtor.

         4.25 OTHER PARTIES AND OTHER COLLATERAL.  No renewal or extension of or
any other  indulgence with respect to the  Indebtedness or any part thereof,  no
release  of any  security,  no  release  of any  person  (including  any  maker,
endorser,  guarantor,  or  surety)  liable  on the  Indebtedness,  no  delay  in
enforcement  of payment,  and no delay or admission or lack of diligence or care
in  exercising  any  right or power  with  respect  to the  Indebtedness  or any
security  therefor or guaranty  thereof or under this  Agreement  shall in other
manner  impair or affect the rights of Secured  Party under the law,  under this
Agreement, or under any other agreement pertaining to the other security for the
Indebtedness,  before  foreclosing upon the Collateral for the purpose of paying
the  Indebtedness.  Debtor  waives any right to the  benefit of or to require or
control application of any other security or proceeds thereof, and Debtor agrees
that Secured  Party shall have no duty or  obligation  to Debtor to apply to the
Indebtedness any such other security or proceeds thereof.

         4.26  RELEASE OF FILINGS.  On or before  July 15,  1999,  Debtor  shall
ensure  that a release of all filings (in any public  office)  which  purport to
provide  notice of liens  and/or  obligations  of or against  Debtor or Debtor's
assets,  other than those  listed on Exhibit  "B",  is filed in the  appropriate
public office.

                                    ARTICLE V

                       RIGHTS AND POWERS OF SECURED PARTY

         5.1 GENERAL.  Secured Party before default without  liability to Debtor
may: obtain from any person  information  regarding Debtor or Debtor's business,
which  information any such person also may furnish without liability to Debtor;
endorse as  Debtor's  agent any  instruments,  documents,  or  chattel  paper in
Collateral or  representing  proceeds of  Collateral;  contact  account  debtors
directly to verify  information  furnished by Debtor;  release Collateral in its
possession to any Debtor temporarily or otherwise;  reject as unsatisfactory any
property  hereafter offered by Debtor as Collateral;  set standards from time to
time to govern what may be used as  after-acquired  collateral;  and at any time
transfer any of the Collateral or evidence  thereof into its own name or that of
its  nominee.  Secured  Party,  during  the  continuance  of an Event of Default
without liability to Debtor, may:

                  (a)      require Debtor to give possession or control of any
                          Collateral to Secured Party;

                  (b)      take control of proceeds;

                  (c)      require additional collateral;

                  (d) take control of funds generated by the Collateral, such as
         cash dividends,  interest, and proceeds or refunds from insurance,  and
         use same to reduce any part of the  Indebtedness and exercise all other
         rights which an owner of such Collateral may exercise, except the right
         to vote or dispose of Collateral before an Event of Default; and

<PAGE>

                  (e) demand,  collect,  convert,  redeem,  receipt for, settle,
         compromise,  adjust, sue for, foreclose, or realize upon Collateral, in
         its own name or in the name of Debtor,  as Secured  Party may determine
         in its sole and absolute discretion,

         Secured Party shall not be liable for failure to collect any account or
instrument,  or for any act or omission on the part of the  Secured  Party,  its
officers, agents, or employees,  except willful misconduct. The foregoing rights
and powers of Secured  Party will be in addition to, and not a limitation  upon,
any  rights  and  powers  of  Secured  Party  given  by law,  elsewhere  in this
Agreement,  or otherwise. If Debtor fails to maintain any required insurance, to
the extent  permitted by applicable  law Secured Party may (but is not obligated
to)  purchase  single  interest  insurance  coverage  for the  Collateral  which
insurance may at Secured  Party's  option (i) protect only Secured Party and not
provide any  remuneration  or protection for Debtor  directly,  and (ii) provide
coverage only after the  Indebtedness  has been declared due as herein provided.
The premiums for any such  insurance  purchased by Secured Party shall be a part
of the Indebtedness and shall bear interest as provided in Section 1.2(c) above.

                                   ARTICLE VI

                                     DEFAULT

         6.1      Events of  Default.  The  following  are events of  default
under this  Agreement  ("Events  of Default"):

                  (a)      default  in the timely  payment of any part of the
         Indebtedness  or in  performance  or observance of the terms and
         conditions herein or the Loan Agreement between Debtor and Secured
         Party;

                  (b)  any  warranty,   representation,  or  statement  made  or
         furnished to Secured  Party by Debtor  proves to have been false in any
         material respect when made or furnished;

                  (c)      acceleration of the maturity of debt of Debtor to any
         other person;

                  (d)      loss, theft,  destruction which is not covered by
         Debtor's insurance,  of any Collateral in violation hereof, or
         substantial damage to any Collateral;

                  (e) death, incapacity,  dissolution, merger, or consolidation,
         termination of existence,  insolvency or business  failure of Debtor or
         any person liable on the Indebtedness;  commencement of proceedings for
         the appointment of a receiver for any property of Debtor;  commencement
         of any proceeding  under any bankruptcy or insolvency law by or against
         Debtor (or any corporate  action shall be taken to effect same), or any
         partnership  of which Debtor is a partner,  or by or against any person
         liable  upon the  Indebtedness  or any part  thereof,  or  liable  upon
         Collateral; or

                  (f)      levy on,  seizure,  or  attachment  of any  property
         of Debtor, or a judgment against Debtor, in each case in excess of
         $10,000.

         6.2 REMEDIES OF SECURED  PARTY UPON  DEFAULT.  When an Event of Default
occurs, and at any time thereafter so long as the Event of Default is not cured,
Secured  Party  without  notice or  demand  (except  as  otherwise  required  by
statute),  may declare the Indebtedness in whole or part immediately due and may
enforce  payment of the same and exercise any rights under the Texas UCC, rights
and remedies of Secured Party under this Agreement, or otherwise.  Secured Party
may require  Debtor to assemble the  Collateral and make it available to Secured
Party at a place which is reasonably  convenient  to both  parties.  Expenses of
retaking, holding, preparing for sale, selling, leasing, or the like shall

<PAGE>

include Secured Party's reasonable  attorney's fees and legal expenses.  Secured
Party  shall be  entitled  to  immediate  possession  of all books  and  records
evidencing  any accounts or general  intangibles  or pertaining to chattel paper
covered  by this  Agreement  and  shall  have the  authority  to enter  upon any
premises  upon which any of the same,  or any  Collateral,  may be situated  and
remove the same  therefrom  without  liability.  Secured Party may surrender any
insurance  policies in  Collateral  and receive the  unearned  premium  thereon.
Debtor shall be entitled to any surplus  after payment of the  Indebtedness  and
shall be  liable  to  Secured  Party  for any  deficiency.  The  process  of any
disposition after default available to satisfy the Indebtedness shall be applied
to the  Indebtedness  in such order and in such  manner as Secured  Party in its
discretion  shall  decide.  If, in the  opinion of Secured  Party,  there is any
question that a public sale or  distribution  of any Collateral will violate any
state or federal securities law, Secured Party (i) may offer and sell securities
privately to purchasers who will agree to take them for investment  purposes and
not with a view to distribution  and who will agree to imposition of restrictive
legends on the  certificates  representing  the security,  or (ii) may sell such
securities in an intrastate  offering  under Section  3(a)(11) of the Securities
Act of 1933,  and no sale so made in good faith by Secured Party shall be deemed
to be not "commercially reasonable" because so made.

                                   ARTICLE VII

                                     GENERAL

         7.1 PARTIES BOUND.  Secured Party's rights under this Agreement and the
Security Interest shall inure to the benefits of its successors and assigns, and
in the event of any  assignment  or transfer of any of the  Indebtedness  or the
Collateral,  Secured  Party  thereafter  shall  be  fully  discharged  from  any
responsibility  with respect to the Collateral so assigned or  transferred,  but
Secured  Party shall  retain all rights and powers  hereby given with respect to
any of the  Indebtedness  or  Collateral  not so  assigned or  transferred.  All
representations, warranties, and agreements of Debtor if more than one are joint
and several, and all shall be binding upon the personal representatives,  heirs,
successors, and assigns of Debtor.

         7.2 WAIVER.  No delay of Secured Party in exercising any power or right
shall operate as a waiver thereof;  nor shall any single or partial  exercise of
any power or right preclude other or further exercise thereof or the exercise of
any other power or right.  No waiver by Secured Party of any right  hereunder of
any default by Debtor shall be binding upon Secured Party unless in writing, and
no failure by Secured  Party to exercise any power or right  hereunder or waiver
of any  default  by Debtor  shall  operate  as a waiver of any other or  further
exercise of such right or power of any further default.

         7.3 AGREEMENT CONTINUING.  This Agreement shall constitute a continuing
agreement,  applying to all future as well as existing transactions,  whether or
not of the  character  contemplated  at the date of this  Agreement,  and if all
transactions between Secured Party and Debtor shall be closed at any time, shall
be equally  applicable to any new  transactions  thereafter.  Provisions of this
Agreement,  unless  by their  terms  exclusive,  shall be in  addition  to other
agreements between the parties.

         7.4 DEFINITIONS. Unless the context indicates otherwise, definitions in
the  Texas  UCC  apply to words  and  phrases  in this  Agreement;  if Texas UCC
definitions conflict, Chapter 9 definitions apply.

         7.5 NOTICE.  Notices  required herein or under  applicable law shall be
deemed  reasonable if mailed postage  prepaid at least 5 days before the related
action (or if the Texas UCC  elsewhere  specifies a longer  period,  such longer
period) to the address shown above.

         7.6  INTEREST.  No  agreement  relating  to the  Indebtedness  shall be
construed to be a contract for or to authorize charging or receiving, or require
the  payment or permit the  collection  of,  interest  at a rate

<PAGE>

or in an  amount  above  that  authorized  by law.  Interest  payable  under any
agreement  above that  authorized by law shall be reduced  automatically  to the
highest amount permitted by law.

         7.7  MODIFICATIONS.  No  provision  hereof shall be modified or limited
except by a written agreement  expressly  referring hereto and to the provisions
so modified or limited and signed by Debtor and Secured Party,  nor by course of
conduct, usage of trade, or by the law merchant.

         7.8      SEVERABILITY.  The unenforceability  of any provision  of this
Agreement shall not affect the enforceability or validity of any other
provision.

         7.9 GENDER AND NUMBER.  Where appropriate,  the use of one gender shall
be construed to include the others or any of them; and the singular number shall
be construed to include the plural, and vice versa.

         7.10  Applicable  Law and  Venue.  THIS  AGREEMENT  SHALL BE  CONSTRUED
ACCORDING TO THE LAWS OF THE STATE OF TEXAS AND THE LAWS OF THE UNITED STATES OF
AMERICA  APPLICABLE TO TRANSACTIONS  IN THE STATE OF TEXAS.  Except at otherwise
stated,  this  Agreement  and  the  Security  Interest  shall  be  construed  in
accordance  with the Texas Uniform  Commercial Code [Texas Business and Commerce
Code Sec. 1.01, et seq. ("Texas UCC")].  This Agreement is performable by Debtor
in the county of Secured Party's address set out above.

         7.11     FINANCING  STATEMENT.  A carbon,  photographic,  or other
reproduction of this security agreement
or any financing statement covering the Collateral shall be sufficient as a
financing statement.

         7.12  LIMITATIONS  OF LAW. If any law prohibits or limits any charge or
expense  provided  for in this  Agreement  in  connection  with any loan secured
hereby,  such charge or expense will not be made or incurred in connection  with
such loan beyond the limits permitted by such law.

         EXECUTED this 16th day of June, 1999.

                                     DEBTOR:

                                      ------

                                      APS CONSULTING, INC., a Texas corporation

                                      By:    /s/ James J. Connors, Jr.
                                             ---------------------------
                                      Name:  James J. Connors, Jr.

                                      Title:  President

                                      SECURED PARTY:
                                      -------------

                                      APSC, INC., a Delaware corporation

                                      By:     /s/ Duane Boyd
                                             ------------------------------
                                      Name:    Duane Boyd
                                             ------------------------------
                                      Title:   President
                                             ------------------------------

<PAGE>

                                   EXHIBIT "A"

                             List of Debtor's Assets

         (a)  all  equipment,   fixtures,   furnishings,   inventory,   building
materials, and articles of personal property (the "Personalty") now or hereafter
owned by Debtor, including but not limited to the Personalty attached to or used
in or on the Land or in or about the  Improvements  more fully  described in the
Exhibit "C"  hereafter  or that are  necessary  or useful for the  complete  and
comfortable  use and  occupancy of the  Improvements  for the purposes for which
they were or are to be attached,  placed, erected,  constructed or developed, or
which  Personalty is or may be used in or related to the planning,  development,
financing or operation of the Improvements,  and all renewals of or replacements
or substitutions for any of the foregoing,  whether or not the same are or shall
be attached to the Land or Improvements;

         (b)      all water and water rights, timber, crops, and mineral
interests pertaining to the Land;

         (c)      all  plans  and  specifications  for  the  Improvements  and
for any  future  development  of or construction on the Land;

         (d) (i) all accounts,  deposits,  bank  accounts,  funds,  instruments,
notes  or  chattel  paper  arising  from or by  virtue  of any  transactions  or
operations related to the Land, the Improvements, the Personalty, the Leases, or
the  Rents  and (ii) any  investment  property,  as  defined  in the  Texas  UCC
("Investment Property");

         (e) all  Debtor's  rights  (but not  Debtor's  obligations)  under  any
documents,  contracts,  contract  rights,  accounts,  commitments,  construction
contracts (and all payment and performance bonds, statutory or otherwise, issued
by any  surety  in  connection  with any such  construction  contracts,  and the
proceeds of such bonds),  architectural  contracts,  engineering contracts,  and
general intangibles (including without limitation  trademarks,  trade names, and
symbols) arising from or by virtue of any transactions  related to the Land, the
Improvements, or the Personalty;

         (f) all permits,  licenses,  franchises,  certificates,  accreditation,
registrations and authorizations of all federal, state and local governmental or
regulatory  authority,  and other rights and  privileges  obtained in connection
with the Land, the Improvements, or the Personalty and the operation thereof;

         (g) all development rights,  utility commitments,  water and wastewater
taps, living unit equivalents, capital improvement project contracts, letters of
credit,  and utility  construction  agreements with any governmental  authority,
including  municipal utility  districts,  or with any utility companies (and all
refunds and reimbursements thereunder) relating to the Land or the Improvements;

         (h)      all proceeds arising from or by virtue of the sale,  lease or
other  disposition of the Land, the Improvements, or the Personalty;

         (i)      all proceeds  (including  premium refunds) of each policy of
insurance  relating to the Land, the Improvements, or the Personalty;

         (j) all proceeds from the taking of any of the Land, the  Improvements,
the Personalty,  or any rights appurtenant thereto by right of eminent domain or
by private or other purchase in lieu thereof,

<PAGE>

including change of grade of streets,  curb cuts or other rights of access,  for
any public or quasipublic use under any law;

         (k) all right,  title,  and  interest of Debtor in and to all  streets,
roads, public places, easements, and rights-of-way, existing or proposed, public
or private,  adjacent to or used in connection with, belonging, or pertaining to
the Land;

         (l)  all of  Debtor's  rights  (but  not  Debtor's  obligations)  under
existing  and  future  residency  or  occupancy  agreements,  licenses,  leases,
including subleases,  concession  agreements,  management agreements and any and
all extensions,  renewals,  modifications,  and replacements of such agreements,
upon or of any part of the Land or  Improvements,  including  cash or securities
deposited  and  guaranties  to  secure  performance  by  the  tenants  of  their
obligations thereunder (the "Leases");

         (m) all of the rents, receipts,  royalties,  bonuses,  issues, profits,
revenues,  or other benefits of the Land, the  Improvements,  the Leases, or the
Personalty,  including  those now due or to become due by virtue of any Lease or
other  agreement  for the  occupancy  or use of all or any  part of the  Land or
Improvements (the "Rents");

         (n) all  consumer  goods  located  in,  on,  or  about  the Land or the
Improvements or used in connection with the use or operation  thereof;  however,
neither the term "consumer goods" nor the term "Personalty"  includes  clothing,
furniture,   appliances,  linens,  china,  crockery,   kitchenware,   inventory,
medicines,  drugs or personal  effects used  primarily  for the operation of the
Property;

         (o) all other interests of every kind and character that Debtor now has
or at any time hereafter acquires in and to the Land, Improvements,  Personalty,
Leases,  and  Rents  and all  property  that is used  or  useful  in  connection
therewith, including rights of ingress and egress and all reversionary rights or
interests  of Debtor with respect to such  property  and all of Debtor's  rights
(but not Debtor's obligations) under any covenants, conditions, and restrictions
for the Land, as the same may be amended from time to time,  including  Debtor's
rights,   title,  and  interests  thereunder  as  declarant  or  developer,   if
applicable; and

         (p)      all products and proceeds of the Personalty.

<PAGE>

                                   EXHIBIT "B"

                                  Encumbrances

American  Physicians  Service  Group,  Inc., a Texas  corporation  ("APS"),  has
certain  liens and  security  interests  in the  assets and  property  of Debtor
existing on the date of this Agreement,  which liens and security  interests are
junior to the liens and security  interests  granted by virtue of this Agreement
pursuant to that certain  Subordination  Agreement between APS and Secured Party
dated as of the date of this Agreement.

Access  Capital,  Inc., a New York  corporation,  has certain liens and security
interests  in the assets and  property  of Debtor  existing  on the date of this
Agreement,  which  liens  and  security  interests  are  senior to the liens and
security  interests granted by virtue of this Agreement pursuant to that certain
Interparty  Agreement  between  Secured Party and Access Capital dated as of the
date of this Agreement..

<PAGE>

                                   EXHIBIT "C"

                                  Real Property

17171 Park Row, Suite 120
Houston, Texas  77084
Harris County

318 Magnolia Avenue, Suite 3
Fairhope, Alabama  36532
Baldwin County

4294 Lakeland Drive, Suite 200
Jackson, Mississippi  39208
Rankin CountyExhibit 10.79

                             SUBORDINATION AGREEMENT

         THIS SUBORINATION  AGREEMENT is made as of the 16th day of June, 1999,
by and between American  Physicians Service Group, Inc., a Texas corporation
(the "Creditor"), and APSC, INC., a Delaware corporation ("APSC").

                              W I T N E S S E T H:

WHEREAS, the Creditor has extended certain loans and financial accommodations to
APS Consulting,  Inc., a Texas  corporation (the "Company")  pursuant to certain
refinancing  agreements,  loan agreements and instruments executed in connection
therewith (collectively, the "Creditor Agreements"); and

         WHEREAS, the Company is indebted to the Creditor, which indebtedness is
secured  by  certain  security  interests  in the  assets  of the  Company  (the
"Creditor Collateral") pursuant to the Creditor Agreements; and

         WHEREAS,  pursuant to the terms of that certain  Loan  Agreement by and
between the Company and APSC,  and that certain  Promissory  Note by and between
the Company and APSC, both dated as of June 16, 1999,  (collectively,  the "Loan
Agreement"), APSC may, from time to time, advance funds to the Company; and

         WHEREAS,  pursuant to the terms of that certain  Security  Agreement by
and  between the Company  and APSC,  of even date with the Loan  Agreement  (the
"APSC Security Agreement"), APSC desires to obtain a security interest in all of
the assets of the Company (the "APSC Collateral") that is senior to the security
interests held by Creditor; and

         WHEREAS,  the Creditor  and APSC wish to enter into certain  agreements
with respect to the administration of their respective security interests in the
Creditor Collateral and the APSC Collateral;

         NOW, THEREFORE, the parties hereto agree as follows:

         1.       The Creditor  consents to the  execution  and delivery by the
Company of the Loan  Agreement  and the APSC Security Agreement.

         2.  Notwithstanding  any  provisions  to the  contrary in the  Creditor
Agreements or the APSC Security  Agreement,  the respective orders or priorities
which would  ordinarily  result from the time of granting and the time and place
of  perfection  of the  respective  security  interests of the Creditor and APSC
under the Uniform Commercial Code as in effect in any jurisdiction or otherwise:

                  (a)      the  security  interest  of APSC in all the assets of
         the  Company  shall be superior to and have priority over the security
         interest of the Creditor in the APSC Collateral; and

<PAGE>

                  (b)      the  security  interest of the Creditor in the
         Creditor  Collateral  shall be junior to and be subordinate to the
         security interest of APSC.

         3. APSC agrees to give the Creditor notice of any default, acceleration
or  enforcement  of its  security  interest  under the Loan  Agreement,  and the
Creditor  agrees  to  give  to  APSC  notice  of any  default,  acceleration  or
enforcement of its security interest under the Creditor Agreements, in each case
prior to or concurrently with the giving of such notice to the Company.

         4. At such time as the Company's  obligations to the Creditor  pursuant
to the Creditor  Agreements  shall have been paid and  discharged  in full,  the
Creditor will assign its security interest in all of the Creditor  Collateral to
APSC and deliver to APSC all instruments and documents  included in the Creditor
Collateral  and in the  possession  of the  Creditor.  The Company  consents and
agrees to such transfer and agrees that any such instruments and documents shall
thereafter  be held by APSC  subject  to the  provisions  of the  APSC  Security
Agreement.  The cost and expense of effectuating  such assignment shall be borne
by the Company.

         5. The  Creditor  shall not  assign or  transfer  any claim  against or
interest  of any  kind in the  Creditor  Collateral  to any  person  while  this
Agreement  remains in effect  unless  such  person  shall  execute an  agreement
reasonably satisfactory to APSC to be bound by this Agreement.

         6. APSC shall not assign or transfer  any claim  against or interest of
any kind in the APSC  Collateral to any person while this  Agreement  remains in
effect unless such person shall execute an agreement reasonably  satisfactory to
the Creditor to be bound by this Agreement.

         7. In the event of  commencement  of  foreclosure  or other exercise of
remedies under the Creditor Agreements and under the Loan Agreement and Security
Agreement,  the  Creditor  and APSC  will  cooperate  in the  exercise  of their
respective remedies.

         8. (a) All notices and reports  required to be given hereunder shall be
hand  delivered or sent by prepaid  certified  mail,  return  receipt  requested
(confirmed  by telefax if possible)  and shall be deemed to have been given when
received. Notices and reports to the Creditor shall be addressed to the Creditor
at:

                                    AMERICAN PHYSICIANS SERVICE GROUP, INC.
                                    1301 Capital of Texas Highway, Suite C-300
                                    Austin, Texas 78746
                                    Telephone No.:  512-314-4301
                                    Telefax No.:  512-314-4398

<PAGE>

and notices and reports to APSC shall be addressed to APSC at:

                                   APSC, Inc.

                                    1301 Capital of Texas Highway, Suite C-300
                                    Austin, Texas 78746
                                    Telephone No.:  512-314-4301
                                    Telefax No.:  512-314-4398

or such other person or at such other address as either the Creditor or APSC may
from time to time specify.

                  (b) APSC will give the Creditor prompt notice of any amendment
to or extension or termination of the Loan Agreement or the Security  Agreement,
and of any other agreement,  document or instrument relating to or affecting the
APSC  Collateral  or providing  for the  extension to the Company of  additional
credit.  The  Creditor  will give APSC  prompt  notice  of any  amendment  to or
extension or termination of the Creditor Agreements, and of any other agreement,
document or  instrument  relating to or  affecting  the Creditor  Collateral  or
providing for the extension to the Company of additional  credit.  In each case,
the  notifying  party shall provide the other party with a copy of an agreement,
document or instrument referred to in its notice.

         9. If any dispute shall arise  between the parties  hereto with respect
to this  Agreement  or with  respect to the rights or  obligations  hereunder of
either party,  the parties agree to submit to  arbitration  in Austin,  Texas in
accordance  with  the  rules  of  the  American  Arbitration   Association  then
obtaining.

         10.      THIS  AGREEMENT  SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE  WITH THE LAWS OF THE STATE OF TEXAS.

         11.      THE  PARTIES  HERETO  DO  HEREBY  WAIVE  ANY AND ALL  RIGHT TO
A TRIAL BY JURY IN ANY  ACTION  OR PROCEEDING ARISING OUT OF THIS AGREEMENT.

<PAGE>

IN WITNESS  WHEREOF,  the parties  hereto have executed this Agreement as of the
date first above written.

                                     AMERICAN PHYSICIANS SERVICE GROUP, INC.

                                     By:         /s/ W.H. Hayes
                                                ----------------------------

                                     Print Name:  W.H. Hayes
                                                ----------------------------

                                     Title:      Sr. V.P. - Finance
                                                ----------------------------

                                     APSC, INC.

                                     By:           /s/ Duane Boyd
                                                ---------------------------

                                     Print Name:   Duane Boyd
                                                ---------------------------

                                     Title:        President
                                                ---------------------------

The undersigned  acknowledges  receipt of a copy of the foregoing  Agreement and
consent to the provision thereof:

APS CONSULTING, INC.

By:          /s/ James J. Connors
            ----------------------------

Print Name:   James J. Connors
            ----------------------------

Title:       President
            ----------------------------

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