Document:

THE CHASE MANHATTAN BANK

                                 PROMISSORY NOTE

$ 470,000.00                                                    Melville, N.Y.
  ----------                                                    --------------

                                                          Date: August 24, ,2000
                                                                ----------------

     On October 23, 2000 (insert specific date or "DEMAND"), for value received,
the undersigned  hereby promises to pay to the order of THE CHASE MANHATTAN BANK
(the  "Bank") at its offices at 395 North  Service  Road,  Melville,  N.Y.  Four
hundred   seventy   thousand  and  00/100  DOLLARS  with  interest   payable  on
______________________   (specific   date)   and   the   _______   day  of  each
______________  (quarter,  month,  etc.)  thereafter  (and at maturity) at a per
annum  rate of 1/2%  above the Bank's  Prime  Rate  (which  shall be the rate of
interest as is publicly  announced at the Bank's  principal  office from time to
time as its  Prime  Rate),  adjusted  as of the date of each  such  change.  The
foregoing  rate shall be computed  for the actual  number of days elapsed on the
basis of a  360-day  year,  but in no event  shall be  higher  than the  maximum
permitted under applicable law. Interest on any past due amount,  whether at the
due date  thereof or by  acceleration,  shall be paid at a rate of four  percent
(4%) per annum in excess of the above stated  rate,  but in no event higher than
the maximum  permitted under  applicable  law. Time for payment  extended by law
shall be included in the computation of interest.

     The undersigned  hereby grants to the Bank a lien on, security  interest in
and right of set-off  against all monies,  securities  and other property of the
undersigned and the proceeds  thereof now or hereafter  delivered to remain with
or in transit in any manner to the Bank, its  correspondents  or its agents from
or for the undersigned, whether for safekeeping,  custody, pledge, transmission,
collection  or for any other  purpose,  or coming  into  possession,  control or
custody of the Bank,  Chase  Securities Inc., or any other affiliate of the Bank
in any way,  and,  also,  any balance of any deposit  account and credits of the
undersigned  with, and any other claims of the  undersigned  against,  the Bank,
Chase  Securities  Inc., or any other affiliate of the Bank at any time existing
(all of which are collectively called the "Collateral"),  as collateral security
for the payment of this note and all other  liabilities  and  obligations now or
hereafter owed by the  undersigned to the Bank,  contracted  with or acquired by
the Bank,  whether  joint,  several,  direct,  indirect,  absolute,  contingent,
secured,   unsecured,   matured  or  unmatured   (all  of  which  are  hereafter
collectively called  "Liabilities"),  hereby authorizing the Bank at any time or
times,  without notice or demand,  to apply any such  Collateral or any proceeds
thereof to any of such  Liabilities in such amounts as it in its sole discretion
may select,  either  contingent,  unmatured or  otherwise  and whether any other
collateral security therefor is deemed adequate or not.  Undersigned  authorizes
the Bank to deliver to others a copy of this note as written notification of the
undersigned's  transfer  of a  security  interest  in the  Collateral.  The Bank
further  is  authorized  at any time or times,  without  demand or notice to the
undersigned,  to  transfer to or register in the name of its nominee or nominees
all or any part of the Collateral and to exercise any and all rights,  power and
privileges (except that prior to an Event of Default the Bank shall not have the
right  to vote or to  direct  the  voting  of any  Collateral).  The  collateral
security  and other  rights  described  herein shall be in addition to any other
collateral  security  described  in  any  separate  agreement  executed  by  the
undersigned.

<PAGE>

     In the event of: default in the prompt payment of any Liabilities;  default
in any other  indebtedness of the undersigned  (which,  for the purposes of this
sentence, means the undersigned or any guarantor,  surety or endorser of, or any
person  or  entity  which  has  pledged  any  of its  property  to  secure,  any
Liabilities);  complete or partial  liquidation or suspension of any business of
the undersigned;  dissolution,  merger,  consolidation or  reorganization of the
undersigned;  death of or loss of  employment  by an individual or any member of
any partnership (if the undersigned is an individual or a partnership);  failure
to furnish any  financial  information  or to permit  inspection of any books or
records at the Bank's request;  a  representation,  warranty or statement of the
undersigned  proving  false in any  material  respect  when  made or  furnished;
general   assignment   for  the  benefit  of  creditors  or  insolvency  of  the
undersigned;  commencement  of any  proceeding  supplementary  to any  execution
relating to any judgment against the undersigned;  attachment,  distraint, levy,
execution or final judgment  against the  undersigned or against the property of
the  undersigned;  assignment  by the  undersigned  of any  equity in any of the
Collateral  without the written consent of the Bank;  appointment of a receiver,
conservator,  rehabilitator or similar officer for the  undersigned,  or for any
property of the undersigned;  tax assessment by the United States  Government or
any state or political  subdivision thereof against the undersigned;  the taking
of possession of, or assumption of control over, all or any substantial  part of
the property of the undersigned by the United States Government, or any state or
political  subdivision thereof,  foreign government (de facto or de jure) or any
agency of any thereof;  calling of a meeting of  creditors,  assignment  for the
benefit of creditors or bulk sale or notice thereof; any mortgage,  pledge of or
creation of a security  interest in any assets without the consent of the holder
of this note; filing of a petition in bankruptcy, commencement of any proceeding
under any  bankruptcy  or debtor's  law (or similar law  analogous in purpose or
effect) for the relief, reorganization,  composition,  extension, arrangement or
readjustment of any of the obligations by or against the undersigned;  then, and
in any of those events (each, an "Event of Default"), all Liabilities,  although
otherwise  unmatured  or  contingent,  shall  forthwith  become due and  payable
without notice or demand and notwithstanding  anything to the contrary contained
herein or in any other instrument. Further, acceptance of any payments shall not
waive or affect any prior demand or acceleration of these Liabilities,  and each
such  payment  made shall be applied  first to the payment of accrued  interest,
then to the aggregate unpaid principal or otherwise as determined by the Bank in
its sole  discretion.  The  undersigned  hereby  irrevocably  consents to the in
personam  jurisdiction  of the federal  and/or state courts  located  within the
State of New York over  controversies  arising  from or relating to this note or
the Liabilities and irrevocably  waives trial by jury and the right to interpose
any  counterclaims  or  offset  of  any  nature  in  any  such  litigation.  The
undersigned further irrevocably waives presentment,  demand,  protest, notice of
dishonor and all other  notices or demands of any kind in  connection  with this
note or any Liabilities.  The undersigned  shall be jointly and severally liable
hereon.

     The Bank may, at its option,  at any time when in the  judgment of the Bank
the  Collateral is inadequate or the Bank deems itself  insecure,  or upon or at
any time after the occurrence of an Event of Default, proceed to enforce payment
of the same and exercise any of or all the rights and remedies afforded the Bank
by the Uniform Commercial Code (the "Code") or otherwise  possessed by the Bank.
Any requirement of the Code for reasonable  notice to the  undersigned  shall be
deemed to have been complied with if such notice is mailed,  postage prepaid, to
the  undersigned  and such other  persons  entitled to notice,  at the addresses
shown on the  records  of the Bank at least  four (4) days  prior to the time of
sale, disposition or other event requiring notice under the Code.

<PAGE>

     The undersigned  agrees to pay to the Bank, as soon as incurred,  all costs
and  expenses  incidental  to  the  care,  preservation,   processing,  sale  or
collection of or  realization  upon any of or all the  Collateral or incurred in
connection  with the  enforcement  or  collection  of this  note,  or in any way
relating to the rights of the Bank  hereunder,  including  reasonable  inside or
outside  counsel  fees and  expenses.  Each and every  right and  remedy  hereby
granted  to the  Bank  or  allowed  to it by law  shall  be  cumulative  and not
exclusive  and each may be  exercised by the Bank from time to time and as often
as may be necessary.  The  undersigned  shall have the sole  responsibility  for
notifying the Bank in writing that the  undersigned  wishes to take advantage of
any  redemption,  conversion  or other  similar right with respect to any of the
Collateral.  The Bank may  release  any  party  (including  any  partner  or any
undersigned)  without  notice to any of the  undersigned,  whether as co-makers,
endorsers,  guarantors,  sureties,  assigns or otherwise,  without affecting the
liability  of any of the  undersigned  hereof or any partner of any  undersigned
hereof.

     Upon any transfer of this note,  the  undersigned  hereby waiving notice of
any such  transfer,  the Bank may deliver the  Collateral or any part thereof to
the transferee who shall  thereupon  become vested with all the rights herein or
under  applicable law given to the Bank with respect  thereto and the Bank shall
thereafter  forever be  relieved  and fully  discharged  from any  liability  or
responsibility in the matter;  but the Bank shall retain all rights hereby given
to it with respect to any  Liabilities  and  Collateral not so  transferred.  No
modification  or waiver of any of the provisions of this note shall be effective
unless in writing, signed by the Bank, and only to the extent therein set forth;
nor shall any such waiver be  applicable  except in the  specific  instance  for
which given. This agreement sets forth the entire  understanding of the parties,
and the undersigned  acknowledges that no oral or other agreements,  conditions,
promises,  understandings,  representations or warranties exist in regard to the
obligations hereunder, except those specifically set forth herein.

     If the undersigned is a partnership,  the agreement  herein contained shall
remain in force and applicable,  notwithstanding  any changes in the individuals
composing  the  partnership  or any release of any partner or partners and their
partners  shall not  thereby be  released  from any  liability.  If this note is
signed by more than one party, the terms  "undersigned",  as used herein,  shall
include the "undersigned and each of them" and each undertaking herein contained
shall be their joint and several  undertaking,  provided,  however,  that in the
phrases "of the undersigned",  "by the undersigned",  "against the undersigned",
"for the undersigned",  "to the undersigned" and "on the undersigned",  the term
"undersigned"  shall  mean the  "undersigned  or any of them";  and the Bank may
release or exchange any of the Collateral belonging to any of the parties hereto
and it may renew or extend  any of the  liabilities  of any of them and may make
additional advances or extensions of credit to any of them or release or fail to
set off any deposit account or credit any of them or grant other  indulgences to
any of them,  all from time to time,  before or after maturity  hereof,  with or
without further notice to or assent from any of the other parties  hereto.  Each
reference  herein  to the Bank  shall  be  deemed  to  include  its  successors,
endorsees and assigns,  in whose favor the  provisions  hereof shall also inure.
Each reference  herein to the undersigned  shall be deemed to include the heirs,
executors, administrators, legal representatives,  successors and assigns of the
undersigned, all of whom shall be bound by the provisions hereof.

<PAGE>

     The  provisions  of this note shall be construed  and  interpreted  and all
rights and obligations  hereunder  determined in accordance with the laws of the
State of New York, and, as to interest rates, applicable Federal law.

                /s/ Vincent DiSpigno
           ------------------------------
Address:         PWR Systems, Inc.
                 3512 Veterans Memorial Hwy
                 Bohemia, NY 11716THE CHASE MANHATTAN BANK

                               SECURITY AGREEMENT

                                (General Purpose)

This  Agreement,  made this day of, 31,  day of March,  1999  between  THE CHASE
MANHATTAN BANK (herein called the "Bank ") and P.C.  Workstation  Rentals,  Inc.
(herein called the "Borrower "), (the "Agreement ").

     1.  DEFINITIONS  OF  TERMS  USED  HEREIN.   (a)  "Borrower"   includes  all
individuals  executing  this  agreement  as parties  hereto and all members of a
partnership  when the Borrower is a  partnership,  each of whom shall be jointly
and severally liable individually and as partners hereunder.  (b) "Liability" or
"Liabilities" includes all liabilities (primary,  secondary, direct, contingent,
sole,  joint  or  several)  due or to  become  due,  or  that  may be  hereafter
contracted or acquired,  of the Borrower  (including  the Borrower and any other
person) to the Bank,  including without limitation all liabilities arising under
or from any note, loan or credit agreement,  letter of credit, guaranty,  draft,
acceptance,  interest rate or foreign exchange agreement or any other instrument
or agreement of (or the  responsibility of) the Borrower or any loan, advance or
other  extension  of credit or  financial  accommodation  to the Borrower by the
Bank.  (c)  "Proceeds"  means  whatever is  received  when  Collateral  is sold,
exchanged,  leased,  collected or otherwise disposed of and includes the account
arising  when the right to payment is earned  under a  contract.  (d)  "Security
Interest" means a lien or other interest in Collateral  which secures payment of
a liability or performance of an obligation. (e) "Collateral" means the property
described  in  Section 2 hereof  and the  following  described  property  of the
Borrower:

     All personal  property,  whether now or hereafter existing or now ownded or
hereafter  acquired and wherever located,  including but not limited to: (i) all
goods,  inventory,   equipment,  accounts,  furniture,  fixtures,   instruments,
documents,   chattel  paper  and  general  intangibles  and  all  additions  and
accessions thereto; (ii) all products and proceeds of the foregoing, in any form
(including,  without  limitation,  all claims  against third parties for loss or
damage to or destruction on any or all of the  foregoing);  and (iii) all books,
records and other property relating to any of the foregoing.

     All terms used herein  which are also  defined in the New York or any other
applicable  Uniform Commercial Code shall also have at least the meanings herein
as therein defined.

     2.  SECURITY  INTEREST.  As security for the payment of all loans and other
extensions of credit or other financial accommodations now or in the future made
by the Bank to the  Borrower  and all other  liabilities  of the Borrower to the
Bank,  the  Borrower  hereby  grants  to the  Bank a  Security  Interest  in the
above-described  Collateral and all and any Proceeds  arising  therefrom and all
and any products of the Collateral.

<PAGE>

                    [The  Proceeds of the loan hereby  obtained by the Borrower
[DELETE IF          will be used to purchase the Collateral.

NOT

APPLICABLE]

     The Borrower  represents  and warrants  that it is the sole lawful owner of
the Collateral, free and clear of any liens and encumbrances,  and has the right
and power to pledge,  sell,  assign and transfer  absolute  title thereto to the
Bank and that no financing  statement  covering the  Collateral,  other than the
Bank's, is on file in any public office.

     To further secure the Liabilities,  the Borrower hereby grants, pledges and
assigns to the Bank a continuing lien, Security Interest and right of set-off in
and to all money,  securities  and all other  property of the Borrower,  and the
Proceeds thereof,  now or hereafter actually or constructively  held or received
by or for the Bank, Chase Securities Inc. or any other affiliate of the Bank for
any  purpose,   including  safekeeping,   custody,   pledge,   transmission  and
collection,  and in and to all of the Borrower's  deposits (general and special)
and credits with the Bank,  Chase  Securities Inc. or any other affiliate of the
Bank.  The  Borrower  authorizes  the Bank to  deliver  to others a copy of this
Agreement  as written  notification  of the  Borrower's  transfer  of a Security
Interest in the foregoing  property.  The Bank is hereby  authorized at any time
and from  time to time,  without  notice,  to apply  all or part of such  money,
securities, property, proceeds, deposits or credits to any of the Liabilities in
such amounts as the Bank may elect in its sole and absolute discretion, although
the  Liabilities  may then be  contingent  or  unmatured  and whether or not the
Collateral security may be deemed adequate.

     3. USE OF COLLATERAL. Until default, the Borrower may use the Collateral in
any lawful manner. If the Collateral is or is about to become affixed to realty,
the Borrower will, at the Bank's request, furnish the Bank a writing executed by
the mortgagee of the realty  whereby the mortgagee  subordinates  its rights and
priorities to the Bank's Security Interest in the Collateral.  If the Collateral
is or may become  subject to a landlord's  lien,  the Borrower  will at the Bank
request,  furnish the Bank with a landlord's waiver  satisfactory in form to the
Bank.

     4.  INSURANCE.  The  Borrower  will  have  and  maintain  insurance  on the
Collateral  until this  Agreement is  terminated  against all expected  risks to
which it is exposed,  including fire,  theft and collision,  and those which the
Bank may designate, such insurance to be payable to the Bank and the Borrower as
their  interest  may appear;  all policies  shall  provide for thirty (30) days'
written  minimum  cancellation  notice to the Bank. The Bank may act as attorney
for  the  Borrower  in  obtaining,   adjusting,  settling  and  cancelling  such
insurance.

     5. DEFAULT.  Default shall exist hereunder:  (1) if the Borrower shall fail
to pay any amount of the  Liabilities  when due or if the Borrower shall fail to
keep,  observe or perform any  provision of this  Agreement  or of any note,  or
other instrument or agreement  between the Borrower and the Bank relating to any
Liabilities  or if any default or Event of Default  specified  or defined in any
such note,  instrument or agreement shall occur; or (2) if the Borrower shall or
shall attempt to: (a) remove or allow removal of the Collateral  from the county
where the  Borrower  now resides or change the  location of its chief  executive
office or principal place of business;  (b) sell,  encumber or otherwise dispose
of the  Collateral  or any  interest  therein  or  permit  any lien or  Security
Interest (other than the Bank's) to exist thereon or therein, (c) conceal,  hire
out or let the  Collateral,  (d) misuse or abuse the  Collateral,  or (e) use or
allow the use of the Collateral in connection with any undertaking prohibited by
law; or (3) if bankruptcy or  insolvency  proceedings  shall be instituted by or
against the Borrower;  or (4) if the Collateral shall be attached,  levied upon,
seized in any legal proceedings,  or held by virtue of any lien or distress;  or
(5) if the Borrower shall make any  assignment for the benefit of creditors;  or
(6) if the Borrower  shall fail to pay promptly all taxes and  assessments  upon
the  Collateral or the use thereof;  or (7) if the Borrower shall die; or (8) if
the Bank with reasonable cause determines that its interest in the Collateral is
in jeopardy;  or (9) if the Borrower should fail to keep the Collateral suitably
insured  . In the  Event of  Default  or the  breach  of any  undertaking  of or
conditions to be performed by the  Borrower:  (1) all  Liabilities  shall become
immediately due and payable;  and (2) the Borrower agrees upon demand to deliver
the Collateral to the Bank, or the Bank may, with or without legal process,  and
with or without  previous notice or demand for  performance,  enter any premises
wherein the  Collateral may be, and take  possession of the same,  together with
anything therein, and the Bank may make disposition of the Collateral subject to
any and all  applicable  provisions  of the law.  If the  Collateral  is sold at
public  sale,  the Bank may  purchase  the  Collateral  at such sale.  The Bank,
provided  it has sent the  statutory  notice of  default,  may  retain  from the
proceeds of such sale all reasonable  costs incurred in the said taking and sale
and also, all sums then owing by the Borrower,  and any surplus of any such sale
shall be paid to the Borrower.

<PAGE>

     6. GENERAL  AGREEMENTS.  (a) The Borrower agrees to pay the costs of filing
financing  statements  and  of  conducting  searches  in  connection  with  this
Agreement. (b) The Borrower agrees to allow the Bank through any of its officers
or agents,  at all reasonable times, to examine or inspect any of the Collateral
and to examine,  inspect and make extracts from the Borrower's books and records
relating to the  Collateral.  (c) The  Borrower  will  promptly pay when due all
taxes and  assessments  upon the  Collateral or for its use of operation or upon
the proceeds thereof or upon this Agreement or upon any note or other instrument
or agreement evidencing any of the Liabilities.  (d) At its option, the Bank may
discharge taxes,  liens or Security  Interests or other encumbrances at any time
levied  or  placed  on the  Collateral,  and may pay  for  the  maintenance  and
preservation of the Collateral, and the Borrower agrees to reimburse the Bank on
demand for any payment made or any expense  incurred by the Bank pursuant to the
foregoing  authorization,   including  outside  or  in-house  counsel  fees  and
disbursements  incurred  or  expended  by  the  Bank  in  connection  with  this
Agreement.  (e) The  Borrower  hereby  authorizes  the  Bank  to file  financing
statements  and any  amendments  thereto  without the signature of the Borrower.
Such  authorization  is  limited  to  the  Security  Interest  granted  by  this
Agreement.  (f) The  Borrower  agrees  that the Bank has the right to notify (on
invoices  or  otherwise)  account  debtors  and other  obligors or payors on any
Collateral of its assignment to the Bank,  and that all payments  thereon should
be made directly to the Bank,  and that the Bank has full power and authority to
collect, compromise,  endorse, sell or otherwise deal with the Collateral on its
own name or that of the Borrower at any time. (g) The Borrower  agrees to pay or
reimburse  the Bank on  demand  for all  costs and  expenses  incurred  by it in
connection  with the  administration  and  enforcement of this Agreement and the
administration,  preservation,  protection,  collection  or  realization  of any
Collateral (including outside or in-house attorneys' fees and expenses). (h) The
Bank shall not be deemed to have waived any of its rights hereunder or under any
other  agreement,  instrument or paper signed by the Borrower unless such waiver
is in writing  and signed by the Bank.  No delay or  omission on the part of the
Bank in exercising  any right shall operate as a waiver  thereof or of any other
right.  A waiver  upon any one  occasion  shall not be  construed  as a bar or a
waiver of any right or remedy on any  future  occasion.  All of the  rights  and
remedies  of the Bank,  whether  evidenced  hereby  or by any  other  Agreement,
instrument  or  paper,  shall  be  cumulative  and may be  exercised  singly  or
concurrently.  (i)  This  Agreement  shall  be  governed  by  and  construed  in
accordance with the laws of the State of New York. (j) This  Agreement,  and the
Security Interests, obligations, rights and remedies created hereby, shall inure
to the benefit of the Bank and its  successors  and assigns and be binding  upon
the Borrower and its heirs,  executors,  administrators,  legal representatives,
successors and assigns.

<PAGE>

     7. EXECUTION BY THE BANK. This Agreement shall take effect immediately upon
execution by the  Borrower,  and the  execution  hereof by the Bank shall not be
required as a condition to the  effectiveness  of this Agreement.  The provision
for execution of this  Agreement by the Bank is only for purposes of filing this
Agreement  as a  security  agreement  under  the  Uniform  Commercial  Code,  if
execution hereof by the Bank is required for purposes of such filing.

                       P.C. Workstation Rentals, Inc.

                                 (Borrower)

By:                             /s/ David N. Salav
                               -----------------------

                       3512 Veterans Memorial Highway
                             (Number and Street)

                      Bohemia, Suffolk, New York 11716
                            (City, County, State)

Places of business in counties other than above:

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

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

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

THE CHASE MANHATTAN BANK

By:                  Scott M. Creaven, Vice President
                              (Name and Title)

Address:             395 N. Service Rd, Melville, NY
                           (Number, Street, City)

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