SUBSIDIARY GUARANTY

New York, New York                                                 March 7, 2006

     FOR VALUE RECEIVED, and in consideration of credit otherwise extended or to
be extended by Laurus Master Fund, Ltd.  ("Laurus") to or for the account of GSE
Systems,  Inc.,  a  Delaware  corporation  (the  "Parent")  and  other  Eligible
Subsidiary  under and as defined in the  Security  Agreement  referred  to below
(each such Eligible  Subsidiary,  together with the Parent,  the "Companies" and
each,  a  "Company")  from time to time and at any time and for  other  good and
valuable consideration and to induce Laurus, in its discretion, to purchase such
notes or make other  extensions  of credit  and to make or grant such  renewals,
extensions,  releases of collateral or relinquishments of legal rights as Laurus
may deem advisable,  each of the undersigned (and each of them if more than one,
the  liability  under  this  Guaranty  being  joint and  several)  (jointly  and
severally  referred to as  "Guarantors"  or "the  undersigned")  unconditionally
guaranties to Laurus,  its successors,  endorsees and assigns the prompt payment
when due  (whether  by  acceleration  or  otherwise)  of all  present and future
obligations  and  liabilities of any and all kinds of each Company to Laurus and
of all instruments of any nature  evidencing or relating to any such obligations
and liabilities  upon which such Company or one or more parties and such Company
is or may become  liable to Laurus,  whether  incurred by such Company as maker,
endorser,  drawer, acceptor,  guarantors,  accommodation party or otherwise, and
whether  due or to become due,  secured or  unsecured,  absolute or  contingent,
joint or several,  and however or whenever  acquired by Laurus,  whether arising
under, out of, or in connection with (i) that certain  Security  Agreement dated
as of the date hereof by and among the Parent, the other Companies named therein
and Laurus (the "Security Agreement") and (ii) each Ancillary Agreement referred
to in  the  Security  Agreement  (the  Security  Agreement  and  each  Ancillary
Agreement, as each may be amended,  modified,  restated and/or supplemented from
time to time, are coll ectively referred to herein as the  "Documents"),  or any
documents,  instruments or agreements relating to or executed in connection with
the Documents or any documents, instruments or agreements referred to therein or
otherwise,  or any other  obligations  or liabilities of such Company to Laurus,
whether now existing or hereafter  arising,  direct or indirect,  liquidated  or
unliquidated, absolute or contingent, due or not due and whether under, pursuant
to or evidenced by a note, agreement,  guaranty, instrument or otherwise (all of
which  are  herein  collectively   referred  to  as  the   "Obligations"),   and
irrespective of the genuineness,  validity, regularity or enforceability of such
Obligations,  or of any instrument  evidencing any of the  Obligations or of any
collateral  therefor  or of the  existence  or  extent of such  collateral,  and
irrespective of the allowability, allowance or disallowance of any or all of the
Obligations  in any case  commenced  by or against any  Company  under Title 11,
United States  Code, including, without limitation,  obligations or indebtedness
of any Company for  post-petition  interest,  fees, costs and charges that would
have accrued or been added to the Obligations  but for the  commencement of such
case.  Terms not otherwise  defined herein shall have the meaning  assigned such
terms  in  the  Security  Agreement.  In  furtherance  of  the  foregoing,   the
undersigned hereby agrees as follows:

     1. No  Impairment.  Laurus  may at any time and from  time to time,  either
before or after the maturity  thereof,  without notice to or further  consent of
the  undersigned,  extend the time of payment  of,  exchange  or  surrender  any
collateral  for, renew or extend any of the  Obligations or increase or decrease
the interest rate thereon,  or any other  agreement with any Company or with any
other  party  to or  person  liable  on any of the  Obligations,  or  interested
therein, for the extension,  renewal, payment, compromise,  discharge or release
thereof, in whole or in part, or for any modification of the terms thereof or of
any agreement  between Laurus and any Company or any such other party or person,
or make any election of rights Laurus may deem desirable under the United States
Bankruptcy  Code,  as  amended,  or  any  other  federal  or  state  bankruptcy,
reorganization,  moratorium  or  insolvency  law  relating to or  affecting  the
enforcement of creditors' rights generally (any of the foregoing, an "Insolvency
Law") without in any way  impairing or affecting  this  Guaranty.  This Guaranty
shall  be  effective  regardless  of the  subsequent  incorporation,  merger  or
consolidation  of  any  Company,  or any  change  in  the  composition,  nature,
personnel or location of any Company and shall extend to any successor entity to
each Company,  including a debtor in possession or the like under any Insolvency
Law.

     2.  Guaranty  Absolute.  Subject  to  Section  5(c)  hereof,  each  of  the
undersigned  jointly and severally  guarantees that the Obligations will be paid
strictly  in  accordance  with  the  terms of the  Documents  and/or  any  other
document,  instrument  or  agreement  creating or  evidencing  the  Obligations,
regardless  of any law,  regulation  or order now or  hereafter in effect in any
jurisdiction  affecting  any of such  terms or the  rights of any  Company  with
respect  thereto.  Guarantors  hereby  knowingly  accept  the full range of risk
encompassed  within a contract of "continuing  guaranty" which risk includes the
possibility that a Company will contract additional  obligations and liabilities
for which  Guarantors may be liable  hereunder  after such  Company's  financial
condition   or  ability  to  pay  its  lawful  debts  when  they  fall  due  has
deteriorated, whether or not such Company has properly authorized incurring such
additional obligations and liabilities.  The undersigned acknowledge that (i) no
oral representations,  includingany  representations to extend credit or provide
other  financial  accommodations  to any  Company,  have  been made by Laurus to
induce the  undersigned  to enter into this  Guaranty and (ii) any  extension of
credit  to any  Company  shall  be  governed  solely  by the  provisions  of the
Documents. The liability of each of the undersigned under this Guaranty shall be
absolute and  unconditional,  in accordance with its terms,  and shall remain in
full force and effect without  regard to, and shall not be released,  suspended,
discharged,  terminated or otherwise affected by, any circumstance or occurrence
whatsoever,  including, without limitation: (a) any waiver, indulgence, renewal,
extension, amendment or modification of or addition, consent or supplement to or
deletion  from or any  other  action  or  inaction  under or in  respect  of the
Documents or any other instruments or agreements  relating to the Obligations or
any  assignment  or  transfer  of any  thereof,  (b)  any  lack of  validity  or
enforceability  of any Document or other  documents,  instruments  or agreements
relating to the  Obligations or any  assignment or transfer of any thereof,  (c)
any  furnishing  of any  additional  security to Laurus or its  assignees or any
acceptance  thereof or any release of any  security by Laurus or its  assignees,
(d) any limitation on any party's liability or obligation under the Documents or
any other  documents,  instruments or agreements  relating to the Obligations or
any assignment or transfer of any thereof or any invalidity or unenforceability,
in whole or in part, of any such  document,  instrument or agreement or any term
thereof,   (e)  any   bankruptcy,   insolvency,   reorganization,   composition,
adjustment,  dissolution,  liquidation or other like proceeding  relating to any
Company,  or any action  taken with  respect to this  Guaranty by any trustee or
receiver,  or by  any  court,  in  any  such  proceeding,  whether  or  not  the
undersigned  shall have notice or  knowledge  of any of the  foregoing,  (f) any
exchange,  release  or  nonperfection  of any  collateral,  or any  release,  or
amendment  or waiver of or consent to  departure  from any guaranty or security,
for all or any of the  Obligations  or (g) any other  circumstance  which  might
otherwise constitute a defense available to, or a discharge of, the undersigned.
Any amounts due from the  undersigned  to Laurus shall bear interest  until such
amounts are paid in full at the highest rate then applicable to the Obligations.
Obligations include post-petition interest whether or not allowed or allowable.

     3. Waivers.

          (a) This  Guaranty  is a guaranty  of payment  and not of  collection.
     Laurus shall be under no obligation to institute  suit,  exercise rights or
     remedies or take any other  action  against any Company or any other person
     or entity  liable with respect to any of the  Obligations  or resort to any
     collateral  security  held  by it to  secure  any of the  Obligations  as a
     condition precedent to the undersigned being obligated to perform as agreed
     herein and each of the Guarantors hereby waives any and all rights which it
     may have by statute or otherwise  which would  require  Laurus to do any of
     the  foregoing.  Each of the  Guarantors  further  consents and agrees that
     Laurus  shall be under no  obligation  to  marshal  any  assets in favor of
     Guarantors, or against or in payment of any or all of the Obligations. Each
     of the undersigned hereby waives all suretyship  defenses and any rights to
     interpose any defense, counterclaim or offset of any nature and description
     which the undersigned may have or which may exist between and among Laurus,
     any  Company  and/or the  undersigned  with  respect  to the  undersigned's
     obligations  under this  Guaranty,  or which any  Company may assert on the
     underlying  debt,  including  but not limited to failure of  consideration,
     breach of warranty,  fraud, payment (other than cash payment in full of the
     Obligations),   statute  of  frauds,   bankruptcy,   infancy,   statute  of
     limitations, accord and satisfaction, and usury.

          (b)  Each  of  the  undersigned  further  waives  (i)  notice  of  the
     acceptance  of this  Guaranty,  of the  extensions  of  credit,  and of all
     notices and demands of any kind to which the  undersigned  may be entitled,
     including,  without  limitation,  notice of adverse change in any Company's
     financial  condition or of any other fact which might  materially  increase
     the risk of the  undersigned  and (ii)  presentment to or demand of payment
     from anyone whomsoever liable upon any of the Obligations, protest, notices
     of presentment, non-payment or protest and notice of any sale of collateral
     security or any default of any sort.

          (c)  Notwithstanding  any payment or payments made by the  undersigned
     hereunder,  or any setoff or  application  of funds of the  undersigned  by
     Laurus,  the  undersigned  shall not be entitled to be subrogated to any of
     the rights of Laurus  against  any  Company or against  any  collateral  or
     guarantee  or  right  of  offset  held by  Laurus  for the  payment  of the
     Obligations,  nor shall the  undersigned  seek or be  entitled  to seek any
     contribution or reimbursement  from any Company in respect of payments made
     by the  undersigned  hereunder,  until all amounts  owing to Laurus by each
     Company on account of the  Obligations  are  indefeasibly  paid in full and
     Laurus'  obligation  to extend  credit  pursuant to the  Documents has been
     irrevocably terminated. If, notwithstanding the foregoing, any amount shall
     be paid to the  undersigned  on account of such  subrogation  rights at any
     time  when all of the  Obligations  shall  not have  been  paid in full and
     Laurus'  obligation  to extend credit  pursuant to the Documents  shall not
     have been terminated, such amount shall be held by the undersigned in trust
     for  Laurus,  segregated  from other  funds of the  undersigned,  and shall
     forthwith  upon,  and in any event within two (2) business days of, receipt
     by the undersigned,  be turned over to Laurus in the exact form received by
     the undersigned  (duly endorsed by the undersigned to Laurus, if required),
     to be applied against the  Obligations,  whether  matured or unmatured,  in
     such  order as Laurus  may  determine,  subject  to the  provisions  of the
     Documents.  Any and all present and future  obligations  and liabilities of
     each Company to any of the  undersigned  are hereby waived and postponed in
     favor of, and  subordinated  to the full  payment and  performance  of, all
     Obligations of each Company to Laurus.

     4. Security.  All sums at any time to the credit of the undersigned and any
property of the  undersigned  in Laurus'  possession or in the possession of any
bank, financial institution or other entity that directly or indirectly, through
one or more  intermediaries,  controls or is  controlled  by, or is under common
control with, Laurus (each such entity, an "Affiliate")  shall be deemed held by
Laurus or such Affiliate, as the case may be, as security for any and all of the
undersigned's  obligations  and  liabilities  to Laurus and to any  Affiliate of
Laurus,  no matter  how or when  arising  and  whether  under  this or any other
instrument, agreement or otherwise.

     5.  Representations and Warranties.  Each of the undersigned hereby jointly
and  severally  represents  and  warrants  (all  of  which  representations  and
warranties  shall survive until all  Obligations are  indefeasibly  satisfied in
full and the Documents have been irrevocably terminated), that:

          (a) Corporate  Status.  It is a  corporation,  partnership  or limited
     liability company, as the case may be, duly formed, validly existing and in
     good standing under the laws of its jurisdiction of formation  indicated on
     the signature page hereof and has full power,  authority and legal right to
     own its  property  and assets and to transact  the  business in which it is
     engaged.

          (b) Authority and  Execution.  It has full power,  authority and legal
     right to execute and deliver,  and to perform its obligations  under,  this
     Guaranty  and has taken all  necessary  corporate,  partnership  or limited
     liability  company,  as the case may be, action to authorize the execution,
     delivery and performance of this Guaranty.

          (c) Legal, Valid and Binding Character.  This Guaranty constitutes its
     legal,  valid and binding  obligation  enforceable  in accordance  with its
     terms,  except as enforceability  may be limited by applicable  bankruptcy,
     insolvency, reorganization, moratorium or other laws of general application
     affecting the  enforcement of creditor's  rights and general  principles of
     equity that restrict the availability of equitable or legal remedies.

          (d)  Violations.  The  execution,  delivery  and  performance  of this
     Guaranty will not violate any  requirement  of law  applicable to it or any
     contract,  agreement or instrument to which it is a party or by which it or
     any of its property is bound or result in the creation or imposition of any
     mortgage, lien or other encumbrance other than in favor of Laurus on any of
     its property or assets  pursuant to the provisions of any of the foregoing,
     which, in any of the foregoing cases, could reasonably be expected to have,
     either individually or in the aggregate, a Material Adverse Effect.

          (e)  Consents or  Approvals.  No consent of any other person or entity
     (including,  without  limitation,  any creditor of the  undersigned) and no
     consent,  license,  permit,  approval or  authorization  of,  exemption by,
     notice or report  to, or  registration,  filing or  declaration  with,  any
     governmental  authority  is  required  in  connection  with the  execution,
     delivery,  performance,  validity or enforceability of this Guaranty by it,
     except to the extent that the failure to obtain any of the foregoing  could
     not  reasonably  be  expected  to  have,  either  individually  or  in  the
     aggregate, a Material Adverse Effect.

          (f)  Litigation.   No  litigation,   arbitration,   investigation   or
     administrative   proceeding   of  or  before  any  court,   arbitrator   or
     governmental  authority,  bureau or agency is currently  pending or, to the
     best of its knowledge,  threatened (i) with respect to this Guaranty or any
     of the  transactions  contemplated  by this  Guaranty  or (ii)  against  or
     affecting  it, or any of its  property  or  assets,  which,  in each of the
     foregoing cases, if adversely  determined,  could reasonably be expected to
     have a Material Adverse Effect.

          (g) Financial Benefit. It has derived or expects to derive a financial
     or other advantage from each and every loan, advance or extension of credit
     made under the Documents or other  Obligation  incurred by the Companies to
     Laurus.

          (h) Solvency.  As of the date of this Guaranty,  (a) the fair saleable
     value of its assets  exceeds  its  liabilities  and (b) it is  meeting  its
     current liabilities as they mature.

     6. Acceleration.

          (a) If any  breach of any  covenant  or  condition  or other  event of
     default  shall  occur and be  continuing  under any  agreement  made by any
     Company or any of the  undersigned to Laurus,  or either any Company or any
     of the undersigned  should at any time become insolvent,  or make a general
     assignment,  or if a  proceeding  in or under any  Insolvency  Law shall be
     filed or commenced  by, or in respect of, any of the  undersigned,  or if a
     notice of any lien,  levy, or assessment is filed of record with respect to
     any assets of any of the undersigned by the United States of America or any
     department,  agency, or instrumentality  thereof,  or if any taxes or debts
     owing at any time or times  hereafter  to any one of them becomes a lien or
     encumbrance  upon any assets of the undersigned in Laurus'  possession,  or
     otherwise,  any and all Obligations  shall for purposes hereof,  at Laurus'
     option, be deemed due and payable without notice  notwithstanding  that any
     such Obligation is not then due and payable by the Companies.

          (b) Each of the undersigned will promptly notify Laurus of any default
     by such undersigned in its respective performance or observance of any term
     or condition of any  agreement to which the  undersigned  is a party if the
     effect of such default is to cause,  or permit the holder of any obligation
     under such agreement to cause,  such  obligation to become due prior to its
     stated  maturity and, if such an event occurs,  Laurus shall have the right
     to accelerate such undersigned's obligations hereunder.

     7. Payments from Guarantors.  Laurus, in its sole and absolute  discretion,
with  or  without  notice  to the  undersigned,  may  apply  on  account  of the
Obligations any payment from the undersigned or any other guarantors, or amounts
realized from any security for the Obligations,  or may deposit any and all such
amounts realized in a non-interest bearing cash collateral deposit account to be
maintained as security for the Obligations.

     8. Costs. The undersigned  shall pay on demand,  all reasonable costs, fees
and expenses  (including  expenses for legal services of every kind) relating or
incidental to the enforcement or protection of the rights of Laurus hereunder or
under any of the Obligations.

     9. No  Termination.  This is a  continuing  irrevocable  guaranty and shall
remain in full force and effect and be binding upon the undersigned, and each of
the undersigned's successors and assigns, until all of the Obligations have been
indefeasibly  paid in full and Laurus'  obligation to extend credit  pursuant to
the Documents has been irrevocably  terminated.  If any of the present or future
Obligations  are  guarantied  by persons,  partnerships,  corporations  or other
entities in addition to the  undersigned,  the death,  release or  discharge  in
whole  or in  part  or the  bankruptcy,  merger,  consolidation,  incorporation,
liquidation  or dissolution of one or more of them shall not discharge or affect
the liabilities of any undersigned under this Guaranty.

     10. Recapture.  Anything in this Guaranty to the contrary  notwithstanding,
if Laurus  receives  any  payment or  payments  on  account  of the  liabilities
guaranteed   hereby,   which  payment  or  payments  or  any  part  thereof  are
subsequently invalidated,  declared to be fraudulent or preferential,  set aside
and/or  required to be repaid to a trustee,  receiver,  or any other party under
any Insolvency Law, common law or equitable doctrine,  then to the extent of any
sum not finally  retained by Laurus,  the  undersigned's  obligations  to Laurus
shall be reinstated  and this Guaranty shall remain in full force and effect (or
be reinstated) until payment shall have been made to Laurus, which payment shall
be due on demand.

     11. Books and Records.  The books and records of Laurus showing the account
between Laurus and each Company shall be admissible in evidence in any action or
proceeding,   shall  be  binding  upon  the   undersigned  for  the  purpose  of
establishing  the items therein set forth and shall constitute prima facie proof
thereof.

     12. No Waiver.  No failure on the part of Laurus to exercise,  and no delay
in exercising,  any right,  remedy or power  hereunder shall operate as a waiver
thereof, nor shall any single or partial exercise by Laurus of any right, remedy
or power  hereunder  preclude  any other or future  exercise  of any other legal
right, remedy or power. Each and every right, remedy and power hereby granted to
Laurus or  allowed  it by law or other  agreement  shall be  cumulative  and not
exclusive of any other, and may be exercised by Laurus at any time and from time
to time.

     13. Waiver of Jury Trial. EACH OF THE UNDERSIGNED DESIRES THAT ITS DISPUTES
BE RESOLVED BY A JUDGE APPLYING SUCH APPLICABLE LAWS. THEREFORE,  TO ACHIEVE THE
BEST COMBINATION OF THE BENEFITS OF THE JUDICIAL SYSTEM AND OF ARBITRATION, EACH
OF THE  UNDERSIGNED  HERETO  WAIVES ALL  RIGHTS TO TRIAL BY JURY IN ANY  ACTION,
SUIT, OR PROCEEDING BROUGHT TO RESOLVE ANY DISPUTE, WHETHER ARISING IN CONTRACT,
TORT, OR OTHERWISE BETWEEN LAURUS, AND/OR ANY OF THE UNDERSIGNED ARISING OUT OF,
CONNECTED WITH,  RELATED OR INCIDENTAL TO THE RELATIONSHIP  ESTABLISHED  BETWEEN
THEM IN CONNECTION WITH THIS GUARANTY,  ANY DOCUMENT OR THE TRANSACTIONS RELATED
HERETO OR THERETO.

     14.  Governing  Law;  Jurisdiction.  THIS  GUARANTY  CANNOT BE  CHANGED  OR
TERMINATED  ORALLY,  AND SHALL BE  GOVERNED  BY AND  CONSTRUED  AND  ENFORCED IN
ACCORDANCE  WITH THE LAWS OF THE STATE OF NEW YORK  APPLICABLE TO CONTRACTS MADE
AND PERFORMED IN SUCH STATE,  WITHOUT REGARD TO PRINCIPLES OF CONFLICTS OF LAWS.
EACH OF THE  UNDERSIGNED  HEREBY  CONSENTS  AND AGREES THAT THE STATE OR FEDERAL
COURTS LOCATED IN THE COUNTY OF NEW YORK, STATE OF NEW YORK SHALL HAVE EXCLUSIVE
JURISDICTION  TO HEAR AND  DETERMINE  ANY CLAIMS OR DISPUTES  BETWEEN ANY OF THE
UNDERSIGNED,  ON THE ONE HAND, AND LAURUS, ON THE OTHER HAND, PERTAINING TO THIS
GUARANTY OR ANY OF THE  DOCUMENTS OR TO ANY MATTER  ARISING OUT OF OR RELATED TO
THIS GUARANTY OR ANY OF THE DOCUMENTS;  PROVIDED,  THAT EACH OF THE  UNDERSIGNED
ACKNOWLEDGES  THAT ANY APPEALS FROM THOSE COURTS MAY HAVE TO BE HEARD BY A COURT
LOCATED  OUTSIDE  OF THE  COUNTY OF NEW YORK,  STATE OF NEW  YORK;  AND  FURTHER
PROVIDED,  THAT NOTHING IN THIS GUARANTY  SHALL BE DEEMED OR OPERATE TO PRECLUDE
LAURUS FROM BRINGING SUIT OR TAKING OTHER LEGAL ACTION IN ANY OTHER JURISDICTION
TO COLLECT THE  OBLIGATIONS,  TO REALIZE ON THE COLLATERAL OR ANY OTHER SECURITY
FOR THE  OBLIGATIONS,  OR TO ENFORCE A JUDGMENT OR OTHER COURT ORDER IN FAVOR OF
LAURUS.  EACH OF THE  UNDERSIGNED  EXPRESSLY  SUBMITS AND CONSENTS IN ADVANCE TO
SUCH  JURISDICTION  IN ANY ACTION OR SUIT COMMENCED IN ANY SUCH COURT,  AND EACH
UNDERSIGNED  HEREBY  WAIVES ANY  OBJECTION  WHICH IT MAY HAVE BASED UPON LACK OF
PERSONAL  JURISDICTION,  IMPROPER  VENUE OR FORUM  NON  CONVENIENS.  EACH OF THE
UNDERSIGNED  HEREBY WAIVES PERSONAL SERVICE OF THE SUMMONS,  COMPLAINT AND OTHER
PROCESS  ISSUED  IN ANY SUCH  ACTION OR SUIT AND  AGREES  THAT  SERVICE  OF SUCH
SUMMONS, COMPLAINT AND OTHER PROCESS MAY BE MADE BY REGISTERED OR CERTIFIED MAIL
ADDRESSED TO SUCH  UNDERSIGNED IN ACCORDANCE WITH SECTION 18 AND THAT SERVICE SO
MADE SHALL BE DEEMED  COMPLETED  UPON THE EARLIER OF SUCH  UNDERSIGNED'S  ACTUAL
RECEIPT  THEREOF  OR THREE (3) DAYS  AFTER  DEPOSIT  IN THE U.S.  MAILS,  PROPER
POSTAGE PREPAID.

     15.  Understanding  With Respect to Waivers and  Consents.  Each  Guarantor
warrants  and agrees  that each of the waivers  and  consents  set forth in this
Guaranty is made voluntarily and unconditionally after consultation with outside
legal counsel and with full knowledge of its significance and consequences, with
the  understanding  that events  giving rise to any defense or right  waived may
diminish,  destroy or otherwise  adversely  affect  rights which such  Guarantor
otherwise may have against any Company,  Laurus or any other person or entity or
against any collateral.  If,  notwithstanding the intent of the parties that the
terms of this  Guaranty  shall  control in any and all  circumstances,  any such
waivers or consents are determined to be  unenforceable  under  applicable  law,
such waivers and consents shall be effective to the maximum extent  permitted by
law.

     16. Severability.  To the extent permitted by applicable law, any provision
of this Guaranty which is prohibited or unenforceable in any jurisdiction shall,
as to such  jurisdiction,  be ineffective  to the extent of such  prohibition or
unenforceability  without  invalidating the remaining provisions hereof, and any
such prohibition or unenforceability in any jurisdiction shall not invalidate or
render unenforceable such provision in any other jurisdiction.

     17.  Amendments,  Waivers.  No amendment or waiver of any provision of this
Guaranty nor consent to any departure by the undersigned  therefrom shall in any
event be effective  unless the same shall be in writing  executed by each of the
undersigned directly affected by such amendment and/or waiver and Laurus.

     18. Notice.  All notices,  requests and demands to or upon the undersigned,
shall be in writing and shall be deemed to have been duly given or made (a) when
delivered,  if by hand, (b) three (3) days after being sent, postage prepaid, if
by  registered  or certified  mail,  (c) when  confirmed  electronically,  if by
facsimile,  or (d) when delivered, if by a recognized overnight delivery service
in each event,  to the numbers and/or address set forth beneath the signature of
the undersigned.

     19.  Successors.  Laurus  may,  from  time to time,  without  notice to the
undersigned,  sell, assign,  transfer or otherwise dispose of all or any part of
the  Obligations  and/or  rights  under  this  Guaranty.  Without  limiting  the
generality of the foregoing,  Laurus may assign, or grant participations to, one
or more banks,  financial  institutions or other entities all or any part of any
of the  Obligations.  In each such event,  Laurus,  its  Affiliates and each and
every immediate and successive purchaser,  assignee, transferee or holder of all
or any part of the Obligations shall have the right to enforce this Guaranty, by
legal action or  otherwise,  for its own benefit as fully as if such  purchaser,
assignee,  transferee  or holder  were  herein by name  specifically  given such
right.  Laurus shall have an  unimpaired  right to enforce this Guaranty for its
benefit  with respect to that  portion of the  Obligations  which Laurus has not
disposed of, sold, assigned, or otherwise transferred.

     20.  Joinder.  It is  understood  and agreed that any person or entity that
desires to become a Guarantor hereunder, or is required to execute a counterpart
of this  Guaranty  after the date  hereof  pursuant to the  requirements  of any
Document,  shall  become  a  Guarantor  hereunder  by (x)  executing  a  joinder
agreement  in  form  and  substance   satisfactory  to  Laurus,   (y) delivering
supplements  to such  exhibits  and annexes to such  Documents  as Laurus  shall
reasonably  request and/or as may be required by such joinder  agreement and (z)
taking all  actions as  specified  in this  Guaranty as would have been taken by
such such Guarantor had it been an original party to this Guaranty, in each case
with  all  documents  required  above to be  delivered  to  Laurus  and with all
documents and actions required above to be taken to the reasonable  satisfaction
of Laurus.

     21. Release.  Nothing except a court order or indefeasible  payment in full
of the  Obligations  shall release any of the  undersigned  from liability under
this Guaranty.

     22.  Remedies Not  Exclusive.  The remedies  conferred  upon Laurus in this
Guaranty are intended to be in addition to, and not in  limitation  of any other
remedy or remedies available to Laurus under applicable law or otherwise.

     23.  Limitation of  Obligations  under this  Guaranty.  Each  Guarantor and
Laurus (by its acceptance of the benefits of this Guaranty) hereby confirms that
it is its intention that this Guaranty not  constitute a fraudulent  transfer or
conveyance  for  purposes  of  the  Bankruptcy  Code,  the  Uniform   Fraudulent
Conveyance Act of any similar  Federal or state law. To effectuate the foregoing
intention,  each Guarantor and Laurus (by its acceptance of the benefits of this
Guaranty)  hereby  irrevocably  agrees that the  Obligations  guaranteed by such
Guarantor  shall be limited to such amount as will,  after giving effect to such
maximum  amount and all other  (contingent  or  otherwise)  liabilities  of such
Guarantor  that are  relevant  under  such laws and after  giving  effect to any
rights to  contribution  pursuant to any  agreement  providing  for an equitable
contribution  among such  Guarantor  and the other  Guarantors  (including  this
Guaranty),  result in the  Obligations of such Guarantor  under this Guaranty in
respect of such  maximum  amount  not  constituting  a  fraudulent  transfer  or
conveyance.

     IN WITNESS  WHEREOF,  this Guaranty has been executed by the undersigned as
of the date and year here above written.

                                GSE SERVICES COMPANY LLC

                                By:_________________________________
                                Name: John V. Moran
                                Title: Chief Executive Officer

                                Address: 7133 Rutherford Rd., Suite 200,
                                Baltimore, MD 21244
                                Telephone: 410-277-3740
                                Facsimile: 410-277-5287
                                State of Formation: Delaware


                                MSHI, INC.

                                By: ________________________________
                                Name: John V. Moran
                                Title: Chief Executive Officer
                                Address: 7133 Rutherford Rd., Suite 200,
                                Baltimore, MD 21244
                                Telephone: 410-277-3740
                                Facsimile: 410-277-5287
                                State of Formation: Virginia


                                GSE POWER SYSTEMS, INC.

                                By: _______________________________
                                Name: John V. Moran
                                Title: Chief Executive Officer
                                Address: 7133 Rutherford Rd., Suite 200,
                                Baltimore, MD 21244
                                Telephone: 410-277-3740
                                Facsimile: 410-277-5287
                                State of Formation: Delaware


                                GSE ERUDITE SOFTWARE INC.

                                By: _______________________________
                                Name: John V. Moran
                                Title: Chief Executive Officer
                                Address: 7133 Rutherford Rd., Suite 200,
                                Baltimore, MD 21244
                                Telephone: 410-277-3740
                                Facsimile: 410-277-5287
                                State of Formation: Delaware


                                GSE GOVERNMENT & MILITARY
                                SIMULATION SYSTEMS, INC.

                                By: _______________________________
                                Name: John V. Moran
                                Title: Chief Executive Officer
                                Address: 7133 Rutherford Rd., Suite 200,
                                Baltimore, MD 21244
                                Telephone: 410-277-3740
                                Facsimile: 410-277-5287
                                State of Formation: Delaware


                                GSE PROCESS SOLUTIONS, INC.

                                By:_________________________________
                                Name: John V. Moran
                                Title: Chief Executive Officer
                                Address: 7133 Rutherford Rd., Suite 200,
                                Baltimore, MD 21244
                                Telephone: 410-277-3740
                                Facsimile: 410-277-5287
                                State of Formation: Delaware