NOTE


$15,000,000                                                  Philadelphia, PA
                                                            December 18, 1998

For Value Received, MLC HOLDINGS, INC., a Delaware corporation ("Holdings"), MLC
GROUP, INC., a Virginia corporation  ("MLC"), and MLC FEDERAL,  INC., a Virginia
corporation  ("Federal")  (collectively,  the  "Borrowers" and  individually,  a
"Borrower")  hereby  jointly and severally  promise to pay to the order of FIRST
UNION  NATIONAL  BANK (the "Bank'),  in lawful  currency of the United States of
America in  immediately  available  funds at the offices of FIRST UNION NATIONAL
BANK located at Broad and Chestnut Streets,  Philadelphia,  Pennsylvania, on the
earlier to occur of  acceleration of the maturity date as provided in the Credit
Agreement  described below or the Credit  Termination Date, the principal sum of
FIFTEEN MILLION  DOLLARS  ($15,000,000)  or, if less, the then unpaid  principal
amount of all Loans made by the Bank pursuant to the Credit  Agreement  (defined
below).

The Borrowers  jointly and severally  promise also to pay interest on the unpaid
principal  amount hereof in like money at such office from the date hereof until
paid in full at the rates and at the times  provided  in the  Credit  Agreement,
dated December 18, 1998, by and among the Borrowers and the banking institutions
named therein, with First Union National Bank, as Agent (as such may be amended,
modified, supplemented,  restated and/or replaced from time to time, the "Credit
Agreement").

This Note is a Note referred to in the Credit  Agreement.  This Note is entitled
to the  benefits  of and is secured by  security  interests  referred  to in the
Credit  Agreement.  Capitalized  terms used in this Note but not defined  herein
shall have the  meanings  ascribed to such terms in the Credit  Agreement.  This
Note is subject to voluntary prepayment and mandatory repayment prior to demand,
acceleration of maturity or the Credit Termination Date, in whole or in part, as
provided in the Credit Agreement.

In case an Event of Default shall occur and be continuing,  the maturity date of
the principal of and the accrued interest on this Note may be accelerated and be
declared to be due and payable in the manner and with the effect provided in the
Credit Agreement.

Each Borrower hereby waives presentment,  demand,  protest or notice of any kind
in connection with this Note.

Notwithstanding  the face  amount  of this  Note,  the  undersigneds'  liability
hereunder shall be limited,  at all times, to the actual  aggregate  outstanding
indebtedness  relating  to the Loans,  including  all  principal  and  interest,
together  with all fees and  expenses as provided  in the Credit  Agreement,  as
established  by the Bank's books and records  which shall be  conclusive  absent
manifest error.



                                      -1-




THIS NOTE SHALL BE  CONSTRUED IN  ACCORDANCE  WITH AND BE GOVERNED BY THE LAW OF
THE  COMMONWEALTH  OF  PENNSYLVANIA  WITHOUT REGARD TO  PENNSYLVANIA  OR FEDERAL
PRINCIPLES OF CONFLICT OF LAWS.



                           MLC HOLDINGS, INC.


                           By:________________________
                                      Name:
                                     Title:

                           MLC GROUP, INC.

                           By:________________________
                                      Name:
                                     Title:



                           MLC FEDERAL, INC.


                           By:________________________
                                      Name:
                                     Title:



                                      -2-




                                      NOTE

$7,000,000                                                  Philadelphia,  PA
                                                            December  18, 1998

For Value Received, MLC HOLDINGS, INC., a Delaware corporation ("Holdings"), MLC
GROUP, INC., a Virginia corporation  ("MLC"), and MLC FEDERAL,  INC., a Virginia
corporation  ("Federal")  (collectively,  the  "Borrowers" and  individually,  a
"Borrower")  hereby  jointly and  severally  promise to pay to the order of BANK
LEUMI USA (the  "Bank'),  in lawful  currency of the United States of America in
immediately  available funds at the offices of FIRST UNION NATIONAL BANK located
at Broad and Chestnut  Streets,  Philadelphia,  Pennsylvania,  on the earlier to
occur of acceleration  of the maturity date as provided in the Credit  Agreement
described  below or the Credit  Termination  Date,  the  principal  sum of SEVEN
MILLION DOLLARS  ($7,000,000)  or, if less, the then unpaid  principal amount of
all Loans made by the Bank pursuant to the Credit Agreement (defined below).

The Borrowers  jointly and severally  promise also to pay interest on the unpaid
principal  amount hereof in like money at such office from the date hereof until
paid in full at the rates and at the times  provided  in the  Credit  Agreement,
dated December 18, 1998, by and among the Borrowers and the banking institutions
named therein, with First Union National Bank, as Agent (as such may be amended,
modified, supplemented,  restated and/or replaced from time to time, the "Credit
Agreement").

This Note is a Note referred to in the Credit  Agreement.  This Note is entitled
to the  benefits  of and is secured by  security  interests  referred  to in the
Credit  Agreement.  Capitalized  terms used in this Note but not defined  herein
shall have the  meanings  ascribed to such terms in the Credit  Agreement.  This
Note is subject to voluntary prepayment and mandatory repayment prior to demand,
acceleration of maturity or the Credit Termination Date, in whole or in part, as
provided in the Credit Agreement.

In case an Event of Default shall occur and be continuing,  the maturity date of
the principal of and the accrued interest on this Note may be accelerated and be
declared to be due and payable in the manner and with the effect provided in the
Credit Agreement.

Each Borrower hereby waives presentment,  demand,  protest or notice of any kind
in connection with this Note.

Notwithstanding  the face  amount  of this  Note,  the  undersigneds'  liability
hereunder shall be limited,  at all times, to the actual  aggregate  outstanding
indebtedness  relating  to the Loans,  including  all  principal  and  interest,
together  with all fees and  expenses as provided  in the Credit  Agreement,  as
established  by the Bank's books and records  which shall be  conclusive  absent
manifest error.

                                      -3-




THIS NOTE SHALL BE  CONSTRUED IN  ACCORDANCE  WITH AND BE GOVERNED BY THE LAW OF
THE  COMMONWEALTH  OF  PENNSYLVANIA  WITHOUT REGARD TO  PENNSYLVANIA  OR FEDERAL
PRINCIPLES OF CONFLICT OF LAWS.


                           MLC HOLDINGS, INC.


                           By:________________________
                                      Name:
                                     Title:

                           MLC GROUP, INC.

                           By:________________________
                                      Name:
                                     Title:

                           MLC FEDERAL, INC.


                           By:________________________
                                      Name:
                                     Title:


                                      -4-




                                      NOTE


$7,000,000                                                     Philadelphia, PA
                                                              Decebmer 18, 1998

For Value Received, MLC HOLDINGS, INC., a Delaware corporation ("Holdings"), MLC
GROUP, INC., a Virginia corporation  ("MLC"), and MLC FEDERAL,  INC., a Virginia
corporation  ("Federal")  (collectively,  the  "Borrowers" and  individually,  a
"Borrower")  hereby jointly and severally  promise to pay to the order of SUMMIT
BANK (the  "Bank'),  in lawful  currency  of the  United  States of  America  in
immediately  available funds at the offices of FIRST UNION NATIONAL BANK located
at Broad and Chestnut  Streets,  Philadelphia,  Pennsylvania,  on the earlier to
occur of acceleration  of the maturity date as provided in the Credit  Agreement
described  below or the Credit  Termination  Date,  the  principal  sum of SEVEN
MILLION DOLLARS  ($7,000,000)  or, if less, the then unpaid  principal amount of
all Loans made by the Bank pursuant to the Credit Agreement (defined below).

The Borrowers  jointly and severally  promise also to pay interest on the unpaid
principal  amount hereof in like money at such office from the date hereof until
paid in full at the rates and at the times  provided  in the  Credit  Agreement,
dated December 18, 1998, by and among the Borrowers and the banking institutions
named therein, with First Union National Bank, as Agent (as such may be amended,
modified, supplemented,  restated and/or replaced from time to time, the "Credit
Agreement").

This Note is a Note referred to in the Credit  Agreement.  This Note is entitled
to the  benefits  of and is secured by  security  interests  referred  to in the
Credit  Agreement.  Capitalized  terms used in this Note but not defined  herein
shall have the  meanings  ascribed to such terms in the Credit  Agreement.  This
Note is subject to voluntary prepayment and mandatory repayment prior to demand,
acceleration of maturity or the Credit Termination Date, in whole or in part, as
provided in the Credit Agreement.

In case an Event of Default shall occur and be continuing,  the maturity date of
the principal of and the accrued interest on this Note may be accelerated and be
declared to be due and payable in the manner and with the effect provided in the
Credit Agreement.

Each Borrower hereby waives presentment,  demand,  protest or notice of any kind
in connection with this Note.

Notwithstanding  the face  amount  of this  Note,  the  undersigneds'  liability
hereunder shall be limited,  at all times, to the actual  aggregate  outstanding
indebtedness  relating  to the Loans,  including  all  principal  and  interest,
together  with all fees and  expenses as provided  in the Credit  Agreement,  as
established  by the Bank's books and records  which shall be  conclusive  absent
manifest error.

                                      -5-




THIS NOTE SHALL BE  CONSTRUED IN  ACCORDANCE  WITH AND BE GOVERNED BY THE LAW OF
THE  COMMONWEALTH  OF  PENNSYLVANIA  WITHOUT REGARD TO  PENNSYLVANIA  OR FEDERAL
PRINCIPLES OF CONFLICT OF LAWS.


                           MLC HOLDINGS, INC.


                           By:________________________
                                      Name:
                                     Title:

                           MLC GROUP, INC.


                           By:________________________
                                      Name:
                                     Title:


                           MLC FEDERAL, INC.


                           By:________________________
                                      Name:
                                     Title:



                                      -6-




                                      NOTE


$7,000,000                                                  Philadelphia, PA
                                                            December 18, 1998

For Value Received, MLC HOLDINGS, INC., a Delaware corporation ("Holdings"), MLC
GROUP, INC., a Virginia corporation  ("MLC"), and MLC FEDERAL,  INC., a Virginia
corporation  ("Federal")  (collectively,  the  "Borrowers" and  individually,  a
"Borrower") hereby jointly and severally promise to pay to the order of WACHOVIA
BANK (the  "Bank'),  in lawful  currency  of the  United  States of  America  in
immediately  available funds at the offices of FIRST UNION NATIONAL BANK located
at Broad and Chestnut  Streets,  Philadelphia,  Pennsylvania,  on the earlier to
occur of acceleration  of the maturity date as provided in the Credit  Agreement
described  below or the Credit  Termination  Date,  the  principal  sum of SEVEN
MILLION DOLLARS  ($7,000,000)  or, if less, the then unpaid  principal amount of
all Loans made by the Bank pursuant to the Credit Agreement (defined below).

The Borrowers  jointly and severally  promise also to pay interest on the unpaid
principal  amount hereof in like money at such office from the date hereof until
paid in full at the rates and at the times  provided  in the  Credit  Agreement,
dated December 18, 1998, by and among the Borrowers and the banking institutions
named therein, with First Union National Bank, as Agent (as such may be amended,
modified, supplemented,  restated and/or replaced from time to time, the "Credit
Agreement").

This Note is a Note referred to in the Credit  Agreement.  This Note is entitled
to the  benefits  of and is secured by  security  interests  referred  to in the
Credit  Agreement.  Capitalized  terms used in this Note but not defined  herein
shall have the  meanings  ascribed to such terms in the Credit  Agreement.  This
Note is subject to voluntary prepayment and mandatory repayment prior to demand,
acceleration of maturity or the Credit Termination Date, in whole or in part, as
provided in the Credit Agreement.

In case an Event of Default shall occur and be continuing,  the maturity date of
the principal of and the accrued interest on this Note may be accelerated and be
declared to be due and payable in the manner and with the effect provided in the
Credit Agreement.

Each Borrower hereby waives presentment,  demand,  protest or notice of any kind
in connection with this Note.

Notwithstanding  the face  amount  of this  Note,  the  undersigneds'  liability
hereunder shall be limited,  at all times, to the actual  aggregate  outstanding
indebtedness  relating  to the Loans,  including  all  principal  and  interest,
together  with all fees and  expenses as provided  in the Credit  Agreement,  as
established  by the Bank's books and records  which shall be  conclusive  absent
manifest error.


                                      -7-





THIS NOTE SHALL BE  CONSTRUED IN  ACCORDANCE  WITH AND BE GOVERNED BY THE LAW OF
THE  COMMONWEALTH  OF  PENNSYLVANIA  WITHOUT REGARD TO  PENNSYLVANIA  OR FEDERAL
PRINCIPLES OF CONFLICT OF LAWS.



                           MLC HOLDINGS, INC.


                           By:________________________
                                      Name:
                                     Title:

                           MLC GROUP, INC.


                           By:________________________
                                      Name:
                                     Title:



                           MLC FEDERAL, INC.


                           By:________________________
                                      Name:
                                     Title:


                                      -8-




                                      NOTE


$7,000,000                                                 Philadelphia, PA
                                                           Decebmer 18, 1998

For Value Received, MLC HOLDINGS, INC., a Delaware corporation ("Holdings"), MLC
GROUP, INC., a Virginia corporation  ("MLC"), and MLC FEDERAL,  INC., a Virginia
corporation  ("Federal")  (collectively,  the  "Borrowers" and  individually,  a
"Borrower")  hereby jointly and severally promise to pay to the order of KEYBANK
NATIONAL  ASSOCIATION(the  "Bank'),  in lawful  currency of the United States of
America in  immediately  available  funds at the offices of FIRST UNION NATIONAL
BANK located at Broad and Chestnut Streets,  Philadelphia,  Pennsylvania, on the
earlier to occur of  acceleration of the maturity date as provided in the Credit
Agreement  described below or the Credit  Termination Date, the principal sum of
SEVEN MILLION DOLLARS ($7,000,000) or, if less, the then unpaid principal amount
of all Loans made by the Bank pursuant to the Credit Agreement (defined below).

The Borrowers  jointly and severally  promise also to pay interest on the unpaid
principal  amount hereof in like money at such office from the date hereof until
paid in full at the rates and at the times  provided  in the  Credit  Agreement,
dated December 18, 1998, by and among the Borrowers and the banking institutions
named therein, with First Union National Bank, as Agent (as such may be amended,
modified, supplemented,  restated and/or replaced from time to time, the "Credit
Agreement").

This Note is a Note referred to in the Credit  Agreement.  This Note is entitled
to the  benefits  of and is secured by  security  interests  referred  to in the
Credit  Agreement.  Capitalized  terms used in this Note but not defined  herein
shall have the  meanings  ascribed to such terms in the Credit  Agreement.  This
Note is subject to voluntary prepayment and mandatory repayment prior to demand,
acceleration of maturity or the Credit Termination Date, in whole or in part, as
provided in the Credit Agreement.

In case an Event of Default shall occur and be continuing,  the maturity date of
the principal of and the accrued interest on this Note may be accelerated and be
declared to be due and payable in the manner and with the effect provided in the
Credit Agreement.

Each Borrower hereby waives presentment,  demand,  protest or notice of any kind
in connection with this Note.

Notwithstanding  the face  amount  of this  Note,  the  undersigneds'  liability
hereunder shall be limited,  at all times, to the actual  aggregate  outstanding
indebtedness  relating  to the Loans,  including  all  principal  and  interest,
together  with all fees and  expenses as provided  in the Credit  Agreement,  as
established  by the Bank's books and records  which shall be  conclusive  absent
manifest error.


                                      -9-




THIS NOTE SHALL BE  CONSTRUED IN  ACCORDANCE  WITH AND BE GOVERNED BY THE LAW OF
THE  COMMONWEALTH  OF  PENNSYLVANIA  WITHOUT REGARD TO  PENNSYLVANIA  OR FEDERAL
PRINCIPLES OF CONFLICT OF LAWS.



                          MLC HOLDINGS, INC.


                          By:________________________
                                      Name:
                                     Title:

                          MLC GROUP, INC.


                          By:________________________
                                      Name:
                                     Title:



                          MLC FEDERAL, INC.


                          By:________________________
                                      Name:
                                     Title:


                                      -10-




                                      NOTE


$7,000,000                                                Philadelphia, PA
                                                          Decebmer 18, 1998

For Value Received, MLC HOLDINGS, INC., a Delaware corporation ("Holdings"), MLC
GROUP, INC., a Virginia corporation  ("MLC"), and MLC FEDERAL,  INC., a Virginia
corporation  ("Federal")  (collectively,  the  "Borrowers" and  individually,  a
"Borrower")  hereby  jointly and severally  promise to pay to the order of RIGGS
BANK N.A.  (the "Bank'),  in lawful  currency of the United States of America in
immediately  available funds at the offices of FIRST UNION NATIONAL BANK located
at Broad and Chestnut  Streets,  Philadelphia,  Pennsylvania,  on the earlier to
occur of acceleration  of the maturity date as provided in the Credit  Agreement
described  below or the Credit  Termination  Date,  the  principal  sum of SEVEN
MILLION DOLLARS  ($7,000,000)  or, if less, the then unpaid  principal amount of
all Loans made by the Bank pursuant to the Credit Agreement (defined below).

The Borrowers  jointly and severally  promise also to pay interest on the unpaid
principal  amount hereof in like money at such office from the date hereof until
paid in full at the rates and at the times  provided  in the  Credit  Agreement,
dated December 18, 1998, by and among the Borrowers and the banking institutions
named therein, with First Union National Bank, as Agent (as such may be amended,
modified, supplemented,  restated and/or replaced from time to time, the "Credit
Agreement").

This Note is a Note referred to in the Credit  Agreement.  This Note is entitled
to the  benefits  of and is secured by  security  interests  referred  to in the
Credit  Agreement.  Capitalized  terms used in this Note but not defined  herein
shall have the  meanings  ascribed to such terms in the Credit  Agreement.  This
Note is subject to voluntary prepayment and mandatory repayment prior to demand,
acceleration of maturity or the Credit Termination Date, in whole or in part, as
provided in the Credit Agreement.

In case an Event of Default shall occur and be continuing,  the maturity date of
the principal of and the accrued interest on this Note may be accelerated and be
declared to be due and payable in the manner and with the effect provided in the
Credit Agreement.

Each Borrower hereby waives presentment,  demand,  protest or notice of any kind
in connection with this Note.

Notwithstanding  the face  amount  of this  Note,  the  undersigneds'  liability
hereunder shall be limited,  at all times, to the actual  aggregate  outstanding
indebtedness  relating  to the Loans,  including  all  principal  and  interest,
together  with all fees and  expenses as provided  in the Credit  Agreement,  as
established  by the Bank's books and records  which shall be  conclusive  absent
manifest error.


                                      -11-





THIS NOTE SHALL BE  CONSTRUED IN  ACCORDANCE  WITH AND BE GOVERNED BY THE LAW OF
THE  COMMONWEALTH  OF  PENNSYLVANIA  WITHOUT REGARD TO  PENNSYLVANIA  OR FEDERAL
PRINCIPLES OF CONFLICT OF LAWS.


                           MLC HOLDINGS, INC.


                           By:________________________
                                      Name:
                                     Title:

                           MLC GROUP, INC.


                           By:________________________
                                      Name:
                                     Title:



                           MLC FEDERAL, INC.


                           By:________________________
                                      Name:
                                     Title:


                                     -12-