Exhibit 10.28

                                ESCROW AGREEMENT


         THIS ESCROW  AGREEMENT is made as of the 1st day of July,  1998, by and
among MLC  Holdings,  Inc.,  a Delaware  corporation  ("MLC"),  Crestar  Bank, a
Virginia banking  association,  as escrow agent (the "Escrow Agent"),  and Nadim
Achi, as representative of the Stockholders (as defined below).

                              W I T N E S S E T H :

         WHEREAS,  pursuant to an Agreement  and Plan of Merger dated as of July
1, 1998 (the "Merger Agreement"),  among MLC, MLC Network Solutions of Virginia,
Inc., a Virginia  corporation  and a wholly owned  subsidiary  of MLC  ("Network
Solutions"),   PCPlus,   Inc.   ("PCPlus"),   and  the  stockholders  of  PCPlus
(collectively,  the  "Stockholders"),  PCPlus was merged  with and into  Network
Solutions (the "Merger");


         WHEREAS,  in connection with the Merger,  all of the outstanding shares
of PCPlus' common stock held by the Stockholders  will be canceled and converted
into the right to receive  the Merger  Consideration  (as  defined in the Merger
agreement), which includes an aggregate of 263,478 shares of MLC's common stock,
$.01 par value (the "MLC Common Shares");


         WHEREAS,  the Merger  Agreement  provides  that, as soon as practicable
after the Closing  Date (as defined in the Merger  Agreement),  MLC Common Share
certificates representing five percent (5%) of the Merger Consideration based on
the Merger  Share Price (as defined  below) (the  "Escrowed  Shares")  and stock
powers  (executed  in blank) with  respect  thereto  shall be  deposited  by the
Stockholders in escrow (the "Escrow Deposit"), to be held and disposed of by the
Escrow Agent as provided herein;


         WHEREAS, pursuant to the Merger Agreement, each of the Stockholders has
appointed  Nadim Achi (or such  individual as may succeed Nadim Achi pursuant to
the  provisions of Section 3 hereof) as his exclusive  agent (Nadim Achi or such
other individual being hereinafter  referred to as the  "Representative") to act
with full  authority  for him and on his behalf in all  matters  relating to the
subject matter of this Agreement; and


         WHEREAS, MLC and the Representative wish to appoint the Escrow Agent to
serve as the escrow  agent  hereunder,  and the Escrow Agent is willing to do so
upon the terms and conditions hereinafter set forth.


         NOW THEREFORE, it is agreed:

                                       1




                                    SECTION 1

             APPOINTMENT OF ESCROW AGENT; CREATION OF ESCROW DEPOSIT

1.1. Appointment of Escrow Agent. MLC and the Representative  hereby appoint the
     ----------------------------
Escrow  Agent,  and the Escrow Agent  hereby  agrees to act, as  depository  and
administrator  of the Escrow  Deposit,  upon the terms and  conditions set forth
below.

1.2. Creation of Escrow Deposit.  Simultaneously with the execution and delivery
     ---------------------------
of this Agreement, the Stockholders,  pursuant to the Merger Agreement, (i) have
executed and delivered to MLC  irrevocable  instructions  to deduct the Escrowed
Shares  from the  number  of MLC  Common  Shares  otherwise  deliverable  to the
Stockholders  in  connection  with the  Merger  and to  deposit on behalf of the
Stockholders the Escrowed Shares with the Escrow Agent in the Escrow Deposit and
(ii) have  delivered to the Escrow Agent,  for deposit into the Escrow  Deposit,
stock powers  (executed in blank) covering the Escrowed  Shares,  the receipt of
such  Escrowed  Shares  and stock  powers is hereby  acknowledged  by the Escrow
Agent.  In addition,  the  Representative  hereby (i)  authorizes MLC to deliver
directly  to the Escrow  Agent all  dividends  and other  distributions  made in
respect of any Escrowed Shares held in the Escrow Deposit (whether paid in cash,
securities or other  property),  all of which dividends and other  distributions
shall be added to and become  part of the  Escrow  Deposit,  and (ii)  agrees to
deliver or cause to be  delivered  to the Escrow  Agent  such  additional  stock
powers  and  other  instruments  of  transfer  (executed  in blank) as MLC shall
reasonably  request  from time to time in  respect of all  securities  and other
property  deposited  into the  Escrow  Deposit  pursuant  to clause  (i) of this
sentence.  

1.3.  Stockholder Rights. While any MLC Common Shares are held in the
      -------------------
Escrow Deposit, and pending the disbursement thereof to MLC or the Stockholders,
as the case may be, in  connection  with any  disbursement  of property from the
Escrow  Deposit in accordance  with Section 2, the  Stockholders  shall have all
rights with respect thereto (including,  without  limitation,  the right to vote
such  shares),  except (i) the right of  possession  thereof,  (ii) the right to
assign or pledge  such  shares or any  interest  therein  and (iii) the right to
possession of any dividends or other distributions  received in respect thereof.

1.4.  Stockholder  Percentage  Interest in Escrow  Deposit.  Attached  hereto as
      -----------------------------------------------------
Schedule 1.4 is a schedule listing each Stockholder,  such Stockholder's address
and Social Security or other tax  identification  number and such  Stockholder's
interest in the Escrow Deposit  (expressed as a percentage,  based on the number
of Escrowed  Shares  delivered to the Escrow Agent at the Closing Date on behalf
of such Stockholder). 

1.5.  Merger Share Price.  The average share price is $13.50 per Escrowed  Share
      -------------------
(the "Merger Share Price").
                                       2


                                    SECTION 2

                          DISPOSITION OF ESCROW DEPOSIT

2.1. Term of Escrow Deposit.
     ----------------------

     2.1.a.  The Escrowed Shares held in the Escrow Deposit shall be held by the
Escrow Agent on the terms and subject to the  conditions set forth herein and in
the Merger  Agreement  (but the Escrow Agent shall have no  responsibility  with
respect to the Merger  Agreement  other  than to  perform  as  provided  in this
Agreement)  to  satisfy  the  indemnification  obligations  of the  Stockholders
pursuant to Section 12 of the Merger Agreement. The Escrow Agent shall release a
portion of the Escrow Deposit to the  Representative on the close of business on
the first  anniversary  of the Closing  Date (the  "Initial  Expiration  Date"),
subject to the terms and conditions set forth in Sections 2.7(a) and 2.8.

     2.1.b.  The Escrowed  Shares held in the Escrow  Deposit  after the Initial
Expiration  Date shall be held by the Escrow  Agent on the terms and  subject to
the  conditions  set forth  herein  and in the Arrow  Agreement  until the first
anniversary of the Closing Date (the "Final  Expiration  Date" and  collectively
with the Initial Expiration Date, the "Expiration  Dates").  Notwithstanding the
foregoing,  any amount that  constitutes  a Claim Reserve (as defined in Section
2.6) shall be released  prior to the Final  Expiration  Date in accordance  with
Section 2.8. On the Final  Expiration  Date,  the Escrow Agent shall release the
remaining  Escrowed  Purchase  Price held in the Escrow  Deposit to the  Selling
Persons,  subject to the terms and conditions  set forth in Sections  2.7(b) and
2.8

2.2. MLC Indemnity  Claims. In the event of the occurrence of an event which MLC
     ---------------------
in its reasonable judgment asserts constitutes a MLC Indemnity Claim (as defined
in the Merger Agreement), MLC shall furnish notice of such event (the "Indemnity
Notice") to the  Representative  and the Escrow Agent promptly (and in any event
on or prior  to the  Expiration  Date),  setting  forth  MLC's  then  good-faith
estimate  of the  reasonably  foreseeable  maximum  amount of its MLC  Indemnity
Claim, and shall make available to the Representative  all relevant  information
which is material to such MLC Indemnity  Claim and which is in the possession of
MLC.

2.3. MLC Indemnity Claims Not Disputed by Representative. If, within thirty (30)
     ----------------------------------------------------
days after receipt of the Indemnity Notice, the Representative does not give the
notice  provided  for in Section  2.4, MLC shall be entitled to make demand upon
the Escrow Agent that it retain for future  return to MLC as and when the amount
is determined, if the amount is not then determined, or that it then disburse to
MLC, if the amount has then been determined,  a number of Escrowed Shares having
a value  equal to the lesser of (i) the full  amount set forth in the  Indemnity
Notice (plus the value of all property held in the Escrow Deposit which arose in
respect of dividends  and  distributions  on such  Escrowed  Shares) or (ii) the
entire  Escrow  Deposit.  For  purposes  of this  Agreement,  the  value of each
Escrowed Share returned to MLC in satisfaction of MLC Indemnity  Claims shall be
calculated based upon the Merger Share Price. 
                                       3


2.4.  MLC  Indemnity  Claims  Disputed  by   Representative  in  Whole.  If  the
      -----------------------------------------------------------------
Representative  disputes  either  the  MLC  Indemnity  Claim  described  in  the
Indemnity  Notice or the  amount MLC seeks as  indemnity  on account of such MLC
Indemnity Claim,  the  Representative  shall,  within thirty (30) days after his
receipt  of the  Indemnity  Notice,  notify  the  Escrow  Agent  and MLC of such
dispute,  setting forth the basis  therefor in reasonable  detail,  based on his
then good-faith belief. In the event the Representative  disputes the entire MLC
Indemnity  Claim,  the Escrow Agent shall not distribute any amount with respect
thereto  until  the  Escrow  Agent  receives  a  written  agreement  signed  the
Representative and MLC stating the amount to which MLC is entitled in connection
with such MLC Indemnity  Claim, or a copy of a court order or judgment  together
with an opinion  of counsel  reasonably  acceptable  to the Escrow  Agent to the
effect  that such order or  judgment  is a final order or judgment of a court of
competent  jurisdiction binding on MLC and the Stockholders from which no appeal
may be taken or for which the time to appeal has  expired (a "Final  Judgment"),
at which time the Escrow Agent shall  disburse to MLC the lesser of (i) a number
of Escrowed Shares having a value (based on the Merger Share Price) equal to the
amount  set forth in such  agreement  or Final  Judgment  (plus the value of all
property  held in the Escrow  Deposit  which arose in respect of  dividends  and
distributions on such Shares) or (ii) the entire Escrow Deposit.

2.5. MLC Indemnity Claims Disputed by  Representative  in Part. In the event the
     ----------------------------------------------------------
Representative  disputes  part of, but not all of, a MLC  Indemnity  Claim,  the
Escrow Agent shall, if the amount is  undetermined,  retain for future return to
MLC, or, if the amount is determined,  return to MLC, the lesser of (i) a number
of Escrowed  Shares having a value (based on the Merger Share Price) equal to an
amount  attributable  to that  portion of the MLC  Indemnity  Claim which is not
disputed by the  Representative  (together  with all property held in the Escrow
Deposit which arose in respect of dividends and  distributions  on such Escrowed
Shares) or (ii) the entire Escrow Deposit. The Escrow Agent shall not distribute
any amount with  respect to the balance of such MLC  Indemnity  Claim  except in
accordance with the procedures set forth in Section 2.4.

2.6.  Notice to Withhold on the Expiration  Dates. On or prior to the any of the
      --------------------------------------------
Expiration  Dates, MLC shall notify the Escrow Agent and the  Representative  of
the amount, if any, to be retained on account of MLC Indemnity Claims concerning
which MLC has given the notice specified in Section 2.2 which, in its reasonable
judgment, continue to constitute MLC Indemnity Claims and which are not, at such
time,  absolute  as to  liability  or  liquidated  as to amount,  such notice to
contain  the  information  specified  in Section  2.2 to the extent it  requires
supplementation or change based on MLC's knowledge on the notice date, whereupon
the Escrow  Agent shall  retain that  portion of the Escrow  Deposit (the "Claim
Reserve")  having a value  (determined  in accordance  with the last sentence of
Section 2.3 with  respect to Escrowed  Shares)  equal to the amount set forth in
the notice given by MLC pursuant to this Section 2.6 (plus all property  held in
the  Escrow  Deposit  which  constitutes,  or arose in  respect  of,  dividends,
distributions  or  interest  on the Escrow  Deposit).  In the event MLC does not
timely provide the notice required by this Section 2.6, and continues to fail to
provide such notice within ten (10) business days after delivery by th
                                        4


Representative  to MLC (with a copy to the  Escrow  Agent) of a demand  that the
notice required by this Section 2.6 be delivered, all remaining property held in
the Escrow Deposit shall be distributed by the Escrow Agent to the  Stockholders
in accordance with Section 2.7.

2.7.  Distribution  Following Expiration Dates.
      -----------------------------------------
      
     2.7.a.  As soon as  practicable  following  the  Initial  Expiration  Date,
one-half of the Escrowed  Shares and such other  property as shall remain in the
Escrow  Deposit  after  deduction  of (i) all  portions  of the  Escrow  Deposit
required by MLC to be retained  pursuant to notice given under  Section 2.6 as a
Claim  Reserve  and  (ii)  all  property  held  in  the  Escrow   Deposit  which
constitutes,  or arose in respect of, dividends, other distributions or interest
on the  Escrow  Deposit  referred  to in clause  (i) of this  sentence  shall be
released from the provisions of this Agreement and  distributed  promptly by the
Escrow  Agent,  as directed by the  Representative,  to the  Stockholders,  by a
nationally  recognized  overnight  courier (at the risk of the  Stockholders) to
such persons at the address as shall have been  specified in a written notice to
the Escrow  Agent from the  Representative,  with any cash  amounts paid by wire
transfer to an account designated in writing by the Representative.  In any such
notice, the Representative shall designate how much of the amount to be released
pursuant  to Section  2.7(a)  shall be payable  in the form of  Escrowed  Shares
valued at the  Average  Share Price and how much shall be payable in the form of
cash..

     2.7.b.  As soon as  practicable  following the Final  Expiration  Date, the
remaining  portion of the Escrow  Deposit after  deduction of (i) all amounts of
the Escrow Deposit required by MLC to be retained pursuant to notice given under
Section 2.6 and (ii) all property held in the Escrow Deposit which  constitutes,
or arose in respect of, dividends, other distributions or interest on the Escrow
Deposit  referred to in clause (i) of this  sentence  shall be released from the
provisions of this Agreement and  distributed  promptly by the Escrow Agent,  as
directed by the Representative,  to the Stockholders, by registered or certified
first class mail to such persons at the address as shall have been  specified in
a written  notice to the  Escrow  Agent from the  Representative,  with any cash
amounts paid in the form of a check issued by and drawn on the Escrow Agent.

2.8.  Retention of Escrow  Deposit  After  Expiration  Dates.  Upon receipt of a
      --------------------------------------------------------
notice  pursuant to Section 2.6,  the Escrow Agent shall  continue to hold after
the Expiration  Dates, with respect to each MLC Indemnity Claim included in such
notice, the Claim Reserve until such time as the Escrow Agent receives a written
agreement signed by the  Representative  and MLC stating the amount,  if any, to
which MLC is  entitled  from the  Escrow  Deposit  in  connection  with such MLC
Indemnity  Claim,  or a copy of a  Final  Judgment  with  respect  to  such  MLC
Indemnity  Claim,  at which  time the Escrow  Agent  shall  return to MLC,  with
respect to such MLC Indemnity  Claim,  the portion of the Claim Reserve having a
value  (determined  in  accordance  with the last  sentence  of Section 2.3 with
respect to Escrowed  Shares) equal to the amount  specified in such agreement or
Final  Judgment (plus the value of all property held in the Escrow Deposit which
                                       5


constitutes, or arose in respect of, dividends, distributions or interest on the
amount of the Claim Reserve to be distributed to MLC) and shall  distribute,  as
directed by the Representative,  to the Stockholders, the remainder of the Claim
Reserve plus all property held in the Escrow Deposit which constitutes, or arose
in respect of, dividends, distributions or interest on such remainder; provided,
however,  that,  to the extent the  distribution  of the  remainder of the Claim
Reserve to the Stockholders  would cause the value of the property  remaining in
the  Escrow  Deposit  after  such  distribution  to fall  below the  amount  (as
stipulated  in MLC's Section 2.6 notice) of all still  unresolved  MLC Indemnity
Claims identified in the Section 2.6 notice, such remainder shall be retained by
the Escrow Agent in the Escrow  Deposit and shall be available for  distribution
to MLC upon the  resolution of any  unresolved  MLC Indemnity  Claims,  and such
remainder shall not be distributed to the Stockholders  until such time, if any,
as such  distribution  can be made  without  causing  the value of all  property
remaining  in the  Escrow  Deposit  to fall  below the  amount of all  remaining
unresolved MLC Indemnity Claims identified in the Section 2.6 notice.

2.9.  Allocation of Escrowed  Shares  Distributed  to MLC. In the event Escrowed
      -----------------------------------------------------
Shares are  retained by the Escrow Agent or  distributed  to MLC pursuant to any
provisions  of this  Section  2, such  Escrowed  Shares  shall be taken from the
Escrowed   Shares   deposited  by  each   Stockholder   in  proportion  to  such
Stockholder's percentage interest in the Escrow Deposit as set forth on Schedule
1.4.
   
2.10.  Reservation of MLC's Rights.  The rights of MLC to receive  disbursements
       ----------------------------
from the Escrow  Account in respect  of MLC  Indemnity  Claims  shall be without
prejudice to any other rights MLC may have, under the Merger Agreement,  to seek
indemnity for MLC Indemnity  Claims. 

2.11.  Fractional  Escrowed  Shares.  In the  event  that a  payment  of any MLC
       -----------------------------
Indemnity Claim would involve fractional Escrowed Shares, the Escrow Agent shall
round the amount of Escrowed Shares necessary to settle such MLC Indemnity Claim
to the nearest whole number.


                                    SECTION 3

                   INVESTMENT OF ESCROW DEPOSIT AND ACCOUNTING

3.1. Investment of Escrow Deposit.  All cash held in the Escrow Deposit shall be
     -----------------------------
invested by the Escrow Agent in Crestfunds US Treasury  Money Funds,  so long as
such fund is rated in the  highest  investment  category  by  Standard  & Poor's
Rating Group or Moody's Investors Service, Inc., or in such other investments as
MLC and the Representative may agree in a writing delivered to the Escrow Agent.
In the event that the Crestfunds US Treasury Money Funds shall cease to be rated
in the highest  investment  category by Standard & Poors Rating Group or Moody's
Investment   Service,   Inc.,   the  Escrow  Agent  shall  notify  MLC  and  the
Representative  in  writing  and  promptly  deposit  all cash held in the Escrow
Deposit  in a fund  that  has  such  rating  until  such  time  as MLC  and  the
Representative  shall  direct the Escrow  Agent in writing to deposit such funds
                                       6


elsewhere.  All interest and other income earned on the Escrow  Deposit shall be
added to, and become part of, the Escrow Deposit,  and the distribution  thereof
shall be subject to the terms of this Agreement.

3.2. Accounting. The Escrow Agent shall provide a written account to MLC and the
     -----------
Representative  at the end of each  month  prior  to the  Expiration  Date  (and
thereafter to the extent any amounts  remain in escrow  pursuant to Section 2.8)
listing  all  transactions  with  respect  to  the  Escrow  Deposit  during  the
immediately preceding month.

                                    SECTION 4


                                  ESCROW AGENT


4.1. Duties.  The duties and obligations of the Escrow Agent shall be determined
     --------
solely by the express  provisions of this  Agreement and shall be limited to the
performance of such duties and obligations as are specifically set forth in this
Agreement,  as it may be  amended  from  time to time  with the  Escrow  Agent's
written consent as provided in Section 5.7.

4.2.  Reliance.  In the  performance of its duties  hereunder,  the Escrow Agent
      ---------
shall be entitled to rely upon any document or instrument reasonably believed by
it to be genuine and signed by MLC or the  Representative.  The Escrow Agent may
assume  that any person  purporting  to give any notice in  accordance  with the
provisions hereof has been duly authorized to do so. 4.3. Liability.  The Escrow
Agent  shall not be liable for any error of  judgment,  or any  action  taken or
omitted  to be taken  hereunder  in good  faith,  except  in the case of its bad
faith,  gross  negligence  or  willful  misconduct.  The Escrow  Agent  shall be
entitled to consult with counsel of its choosing  (including  internal  counsel)
and shall not be liable for any act  suffered  or omitted by it in good faith in
accordance with the advice of such counsel. 

4.4.  Disputes.  In the event that the Escrow Agent shall be uncertain as to its
      ---------
duties or rights hereunder,  or shall receive instructions from any party hereto
with respect to the Escrow Deposit which,  in its opinion,  are in conflict with
any of the  provisions of this  Agreement,  it shall be entitled to refrain from
taking any action until such time as there has been a final determination of the
rights of MLC and the  Stockholders  with  respect  to the  Escrow  Deposit  (or
relevant  portion  thereof).  For purposes of this  Section 4.4,  there shall be
deemed  to  have  been a  final  determination  of the  rights  of MLC  and  the
Stockholders with respect to the Escrow Deposit (or relevant portion thereof) at
such time as Escrow  Agent  shall  receive  (i) an  executed  counterpart  of an
agreement between the  Representative and MLC or (ii) a copy of a Final Judgment
which provides for the  disposition  of the Escrow Deposit (or relevant  portion
thereof).
                                       7



4.5.  Resignation.  The Escrow Agent may resign at any time and be discharged of
      ------------
the duties  imposed  hereunder  (but without  prejudice for any liability in the
case of its bad faith,  gross  negligence  or willful  misconduct  hereunder) by
giving  notice to the  Representative  and MLC at least sixty (60) business days
prior to the date specified for such resignation to take effect,  in which case,
upon the effective date of such resignation:

     4.5.a.  all  property  then held by the  Escrow  Agent  hereunder  shall be
delivered  by it to such person as may be  designated  in writing by MLC and the
Representative,  whereupon the Escrow Agent's obligations  hereunder shall cease
and terminate;

     4.5.b.  if no such person has been designated by such date, all obligations
of the Escrow Agent hereunder shall, nevertheless,  cease and terminate, subject
to clause (c) below; and
 
     4.5.c. the Escrow Agent's sole  responsibility  thereafter shall be to keep
all  property  then  held by it (and to make  the  investments  as  hereinbefore
provided)  and to deliver the same to the successor  escrow agent  designated in
writing by MLC and the  Representative  or, if no such  successor  escrow  agent
shall have been so  designated,  in  accordance  with the  directions of a Final
Judgment,  and the  provisions  of Section 4.7 and  Section 4.8 shall  remain in
effect.

4.6.  Removal of Escrow  Agent.  MLC and the  Representative  may, upon at least
      -------------------------
thirty (30) business days prior written notice to the Escrow Agent,  dismiss the
Escrow Agent hereunder and appoint a successor.  In such event, the Escrow Agent
shall  promptly  account for and deliver to the successor  escrow agent named in
such notice the balance of the Escrow Deposit, including all investments thereof
and accrued income thereon,  on the date of such  accounting and delivery.  Upon
acceptance  thereof and of such accounting by such successor  escrow agent,  and
upon  reimbursement  to the Escrow  Agent of all  expenses  due to it  hereunder
through the date of such  accounting  and  delivery,  the Escrow  Agent shall be
released and discharged  from all of its duties and obligations  hereunder,  but
without prejudice to any liability of the Escrow Agent for its bad faith,  gross
negligence or willful misconduct hereunder.

4.7.  Compensation.  From time to time upon the Escrow Agent's written  request,
      -------------
MLC shall pay the Escrow Agent 100% of its yearly compensation of $1,200 for its
services  hereunder,  including  reasonable  legal fees and other  out-of-pocket
expenses  incurred in the  performance of its duties and the  enforcement of its
rights hereunder. 

4.8.  Indemnification.  MLC indemnify and hold the Escrow Agent harmless against
      ---------------
any  loss,  liability,  claim,  damage,  injury,  demand or  expense,  including
reasonable  legal fees,  arising out of or in connection with the performance of
the Escrow  Agent's  obligations  hereunder,  including  the costs and  expenses
incurred in connection  with the  collection of its fees and including the costs
and expenses of defending  itself against any claim or liability  arising out of
or in connection  with the performance of its duties  hereunder,  except for any
loss,  liability,  claim, damage,  injury,  demand or expense resulting from the
                                       8


Escrow  Agent's bad faith,  gross  negligence or willful  misconduct;  provided,
however,  that  promptly  after the receipt by the Escrow Agent of notice of any
claim or the  commencement of any suit,  action or proceeding,  the Escrow Agent
shall,  if a claim of  indemnification  in respect thereof is to be made against
any of the other parties  hereto,  notify such other parties thereof in writing;
and provided, further, that the indemnifying party or parties shall be entitled,
jointly or severally and at their own expense,  to  participate in or assume the
defense of any such action,  suit or  proceeding.  The right of the Escrow Agent
(or any successor  escrow agent appointed  hereunder) to  indemnification  under
this Section 4.8 shall survive the termination of this Agreement.

                                  MISCELLANEOUS

5.1. Term. This Agreement  shall continue in force until the final  distribution
     -----
of all amounts held by the Escrow Agent in the Escrow Deposit.

5.2. Notices. All notices and other  communications  hereunder shall be given in
     --------
writing and  delivered  personally,  by  registered  or certified  mail (postage
prepaid,  return receipt  requested),  by overnight  courier (postage  prepaid),
facsimile transmission or similar means, to the party to receive such notices or
communications  at the address  set forth below (or such other  address as shall
from time to time be designated by such party to the other parties in accordance
with this Section 5.2):

(a)      If to the Representative, addressed to:


         Nadim Achi
         President
         1851 Alexander Bell Drive
         Reston, VA  20191          Telecopy:  (703) __________


with copy to:


Silverstein and Mullens, P.L.L.C.
1776 K Street, N.W.
Suite 800
Washington, D.C.  20006
Attn:  John P. Warner, Esq.
Telecopy: (202) 452-7989

(b)      If to MLC, addressed:

        MLC Holdings, Inc.
        11150 Sunset Hills Road            Suite 110
        Reston, Virginia

         Attention:  Kleyton L. Parkhurst 
         Telecopy: (703)834-5718


         with a copy to:


         Shaw, Pittman, Potts & Trowbridge
         2300 N Street, N.W.
         Washington, D.C.  20037

         Attention:  John M. McDonald, Esq.
         Telecopy:  (202) 663-8007


(c)      If to Escrow Agent, addressed:

         Crestar Bank
         Corporate Trust Department
         919 East Main Street, 10th Floor
         Richmond, VA  23219

         Attention: Mary Brewer
         Telecopy:  (804) 782-7855



All such  notices  and  communications  hereunder  shall be  deemed  given  when
received,  as evidenced by the signed acknowledgment of receipt of the person to
whom such notice or  communication  shall have been  personally  delivered,  the
acknowledgment  of  receipt  returned  to the  sender by the  applicable  postal
authorities or the confirmation of delivery rendered by the applicable overnight
courier service. A copy of any notice or other  communication given by any party
to any other party hereto,  with reference to this Agreement,  shall be given at
the same time to the other parties to this Agreement.

5.4.  Assignment.  This Agreement shall be binding upon and inure to the benefit
      -----------
of the  parties  hereto and their  respective  representatives,  successors  and
assigns.  Neither this Agreement nor any rights, duties or obligations hereunder
shall be assigned by any party hereto  without the prior written  consent of the
parties  hereto;  provided,  however that no such  consent  shall be required to
confer the duties, rights, and obligations of the Representative  hereunder upon
any person selected as the Representative pursuant to the Merger Agreement.

                                       9



5.5  GOVERNING  LAW.  THE  PARTIES  HERETO  AGREE THAT THIS  AGREEMENT,  AND THE
     ---------------
RESPECTIVE  RIGHTS,  DUTIES AND OBLIGATIONS OF THE PARTIES  HEREUNDER,  SHALL BE
GOVERNED BY AND CONSTRUED IN  ACCORDANCE  WITH THE LAWS OF THE  COMMONWEALTH  OF
VIRGINIA,   WITHOUT  GIVING  EFFECT  TO  THE  PRINCIPLES  OF  CONFLICTS  OF  LAW
THEREUNDER.

5.6.  Counterparts.  This Agreement may be executed in one or more counterparts,
      -------------
each of which shall be deemed an original. 

5.7.  Headings.  The Section headings in this Agreement are for convenience only
      ---------
and do not constitute part of this Agreement.

5.8.  Amendment.  This Agreement may be amended only by a writing signed by MLC,
      ----------
the Escrow Agent and the Representative.
    


                          ARBITRATION OF CERTAIN ISSUES


6.1. Scope and Procedure. In the event that the Representative believes that, as
     --------------------
of any Expiration  Date or as of any time after the Final  Expiration  Date, the
assertion by MLC of any MLC  Indemnification  Claim or the amount of an such MLC
Indemnification  Claim  asserted by MLC is not  reasonable,  the  Representative
shall have the right to submit the issue of the  reasonableness of such asserted
MLC  Indemnification  Claim or claim amount to  arbitration  as provided in this
Section 6. The parties shall mutually agree upon a single arbitrator,  who shall
establish the rules  applicable  to the  arbitration  and whose  decision in the
matter  shall be final and  binding  upon all  concerned.  In the event  that an
agreement on an  arbitrator  to settle the dispute is not reached  within thirty
(30) days after notification of the request for arbitration, it is hereby agreed
that such breach or dispute  shall be resolved by final and binding  arbitration
in  accordance  with the  commercial  arbitration  rules  then in  effect of the
American  Arbitration  Association;   provided,  however,  that  only  a  single
arbitrator shall be used.

6.2.  Effect of Arbitration  Decision.  MLC agrees to take all action within its
      --------------------------------
power  necessary,  including the execution of any written  notices to the Escrow
Agent  required  under this  Agreement,  to effect the  release  from the Escrow
Deposit and the distribution as the Representative  directs,  of all funds found
by the  arbitrator  not be to  reasonably  retained on account of MLC  Indemnity
Claims.  Judgment  upon any award  rendered  may be entered in any court  having
jurisdiction  over the person  against whom such award is  rendered.  Any notice
served in  connection  with any such  arbitration  or entry of  judgment  may be
served in or out of the  Commonwealth of Virginia or in such other manner as may
be permitted by said rules of any said court.  Any expenses of such  arbitration
shall be borne by the  parties  as the  arbitrator  shall  determine;  provided,
however,  that each party shall bear his or her own attorney and expert  witness
fees and expenses.

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

Amendment No. 3 to
Credit Agreement                                     As of June 30, 1998 

                                       10




            
                      
                                                  MLC:

                                                  MLC HOLDINGS, INC.
                                                 /s/ Phillip G. Norton
                                                 ---------------------
                                                 By:   Phillip G. Norton
                                                Its:  Chairman, President & CEO


                                                 ESCROW AGENT:

                                                 CRESTAR BANK

                                                 /s/ M. Brewer
                                                 -------------
                                                 By:   M. Brewer
                                                 Its:  Trust Officer


                                                 REPRESENTATIVE:


                                                       Nadim Achi