CORNERSTONE INTERNET SOLUTIONS CO /DE/
SC 13D/A, 2000-04-07
PREPACKAGED SOFTWARE
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                               S C H E D U L E 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 13)(1)


                       CORNERSTONE INTERNET SOLUTIONS CO.
                                (Name of Issuer)


                          COMMON STOCK, $0.01 PAR VALUE
                         (Title of Class of Securities)


                                    293636106
                                 (CUSIP Number)


                                    Copy to:

Seneca Ventures                           Morrison Cohen Singer & Weinstein, LLP
68 Wheatley Road                          750 Lexington Avenue
Brookville, New York 11545                New York, New York 10022
Telephone (516) 626-3070                  Telephone (212) 735-8600


                 (Name, Address and Telephone Number of Persons
                Authorized to Receive Notices and Communications)

                                February 11, 2000
              (Date of Event which Requires Filing this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of ss.ss. 240.13d - 1(e), 240.13d- 1(f) or 240.13d-1(g),  check
the following box |_|.

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of the schedule,  including all  exhibits.  See Rule  240.13d-7 for other
parties to whom copies are to be sent.


                        (Continued on following page(s))


- --------
     (1) The  remainder  of this cover page shall be filled out for a  reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

     The  information  required on the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934 ("Act") or otherwise  subject to the  liabilities of that section of
the Act but shall be subject to all other  provisions of the Act  (however,  see
the Notes).


<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                Barry Rubenstein

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                         WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                       United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    175,000 shares                                     0.7%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           1,050,000 shares                                   4.2%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    175,000 shares                                     0.7%
              _________________________________________________________________
               10   Shared Dispositive Power

                    1,050,000 shares                                   4.2%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                1,225,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                4.9%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 2 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                              Woodland Venture Fund

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)            WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                           New York


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           175,000 shares                                     0.7%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    175,000 shares                                     0.7%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                               175,0000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                0.7%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       PN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 3 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                 Seneca Ventures

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                      WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                           New York


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           175,000 shares                                     0.7%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    175,000 shares                                     0.7%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                 175,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                0.7%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       PN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 4 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                             Woodland Services Corp.

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)             OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                           New York


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           175,000 shares                                     0.7%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    175,000 shares                                     0.7%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                 175,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                0.7%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       CO
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 5 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                 21st Century Communications Partners, L.P.

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                  WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                           Delaware


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       PN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 6 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                 21st Century Communications T-E Partners, L.P.

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                  WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                           Delaware


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       PN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 7 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
               21st Century Communications Foreign Partners, L.P.

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                    WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                           Delaware


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       PN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 8 of 40

<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                               Michael J. Marocco

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                      OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                        United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 9 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                 John Kornreich

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                      OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 10 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                 Harvey Sandler

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                      OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 11 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                 Andrew Sandler

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                      OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 12 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                 Barry Fingerhut

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                  WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                    United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           1,050,000 shares                                   4.2%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    1,050,000 shares                                   4.2%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                1,050,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                4.2%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 13 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                  Irwin Lieber

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                    WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                    United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           1,050,000 shares                                   4.2%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    1,050,000 shares                                   4.2%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                1,050,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                4.2%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 14 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                Woodland Partners

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                     WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                           New York


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           175,000 shares                                     0.7%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    175,000 shares                                     0.7%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                 175,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                0.7%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       PN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 15 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                           Wheatley Partners II, L.P.

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                   WC, OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                           New York


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    1,050,000 shares                                   4.2%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    1,050,000 shares                                   4.2%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                1,050,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                4.2%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       PN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 16 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                             Applewood Capital Corp.

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                       OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                           New York


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           1,050,000 shares                                   4.2%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    1,050,000 shares                                   4.2%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                1,050,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                4.2%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       CO
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 17 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                  Seth Lieber

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                        OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           1,050,000 shares                                   4.2%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    1,050,000 shares                                   4.2%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                1,050,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                4.2%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 18 of 40
<PAGE>


CUSIP NO.  293636106                      13D
________________________________________________________________________________

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                 Jonathan Lieber

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                       OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           1,050,000 shares                                   4.2%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    1,050,000 shares                                   4.2%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                1,050,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                4.2%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 19 of 40
<PAGE>


================================================================================
CUSIP NO.  293636106                      13D
================================================================================

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                               Marilyn Rubenstein

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                        OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           175,000 shares                                     0.7%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    175,000 shares                                     0.7%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                 175,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                0.7%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 20 of 40
<PAGE>


================================================================================
CUSIP NO.  293636106                      13D
================================================================================

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                The Marilyn and Barry Rubenstein Family Foundation

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                        OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           175,000 shares                                     0.7%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    175,000 shares                                     0.7%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                 175,000 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                0.7%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       OO
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 21 of 40
<PAGE>


================================================================================
CUSIP NO.  293636106                      13D
================================================================================

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                Douglas Schimmel

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                        OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 22 of 40
<PAGE>


================================================================================
CUSIP NO.  293636106                      13D
================================================================================

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                  Hannah Stone

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                        OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 23 of 40
<PAGE>


================================================================================
CUSIP NO.  293636106                      13D
================================================================================

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                    David Lee

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                        OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 24 of 40
<PAGE>


================================================================================
CUSIP NO.  293636106                      13D
================================================================================

1    Name of Reporting Persons
     I.R.S. Identification Nos. of Above Persons (Entities Only)
                                Edward Grinacoff

________________________________________________________________________________
2    Check the Appropriate Box If a Member of a Group                (a)  [_]
     (See Instructions)                                              (b)  [_]

________________________________________________________________________________
3    SEC Use Only


________________________________________________________________________________
4    Source of Funds (See Instructions)                        OO


________________________________________________________________________________
5    Check Box If Disclosure of Legal Proceedings is Required
     Pursuant to Items 2(d) or 2(e)                                       [_]


________________________________________________________________________________
6    Citizenship or Place of Organization                      United States


________________________________________________________________________________
               7    Sole Voting Power

Number of Shares    0 shares                                             0%
Beneficially   _________________________________________________________________
Owned          8    Shared Voting Power
By Each
Reporting           0 shares                                             0%
Person With    _________________________________________________________________
               9    Sole Dispositive Power

                    0 shares                                             0%
              _________________________________________________________________
               10   Shared Dispositive Power

                    0 shares                                             0%
________________________________________________________________________________
11   Aggregate Amount Beneficially Owned By Each Reporting Person
                                    0 shares

________________________________________________________________________________
12   Check Box If the Aggregate Amount in Row (11) excludes
     Certain Shares                                                       [_]
     (See Instructions)

________________________________________________________________________________
13   Percent of Class Represented by Amount in Row (11)                  0%


________________________________________________________________________________
14   Type of Reporting Person (See Instructions)

                                       IN
________________________________________________________________________________
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                                  Page 25 of 40
<PAGE>


     This statement,  dated February 11, 2000,  constitutes  Amendment No. 13 to
the Schedule  13D,  dated  September 11, 1995,  regarding the reporting  persons
ownership of certain  securities  of  Cornerstone  Internet  Solutions  Co. (the
"Issuer").

     The  Schedule  13D  is  hereinafter  referred  to as  the  "Schedule."  All
capitalized  terms used herein and otherwise  undefined  shall have the meanings
ascribed in the Schedule.

     This  Amendment  No. 13 to the  Schedule is filed in  accordance  with Rule
13d-2 of the  Securities  Exchange  Act of 1934,  as amended,  by the  reporting
persons.  It shall refer only to information which has materially  changed since
the filing of the Schedule.

ITEM 2. Identity and Background

     (a)  Edward Grinacoff, is the sole shareholder of MEDG Corp.
     (b)  Address: 767 Fifth Avenue
                   New York, New York 10153
     (c)  Principal Occupation: Investments
     (d)  No.
     (e)  No.
     (f)  Citizenship: United States.

     MEDG Corp  became a general  partner of SCM  effective  on January 1, 2000,
which is the general partner of SIP, a general partner of 21st Century,  T-E and
Foreign.

ITEM 4. Purpose of Transaction.

     Other than the reporting persons' purchase or sale of additional securities
of the Issuer,  no reporting person has any present plan or proposal which would
relate to or result in any of the matters set forth in subparagraphs  (a)-(j) of
Item 4 of Schedule 13D except as set forth herein.

ITEM 5. Interests in Securities of the Issuer.

     (a) The  following  list sets forth the  aggregate  number  and  percentage
(based on 24,926,749 shares of Common Stock outstanding as of December 31, 1999,
as reported by the Issuer in its Form 10-Q for the quarter  ended  November  30,
1999),  of  outstanding  shares  of  Common  Stock  owned  beneficially  by each
reporting person named in Item 2, as of March 24, 2000.




                                 Page 26 of 40
<PAGE>


<TABLE>
<CAPTION>
                                       Shares of                                              Percentage of Shares
                                      Common Stock               Percent of Voting               of Common Stock
            Name                   Beneficially Owned                 Control                  Beneficially Owned
- ------------------------------     ------------------            -----------------            --------------------
<S>                                   <C>                               <C>                           <C>
Barry Rubenstein                      1,225,000(2)(3)(4)                4.9%                          4.9%
Woodland Venture Fund                   175,000(2)(4)                   0.7%                          0.7%
Seneca Ventures                         175,000(2)(4)                   0.7%                          0.7%
Woodland Services Corp.                 175,000(2)(4)                   0.7%                          0.7%
21st Century                                0                            0%                            0%
   Communications
   Partners, L.P.
21st Century                                0                            0%                            0%
   Communications T-E
   Partners, L.P.
21st Century                                0                            0%                            0%
   Communications
   Foreign Partners, L.P.
Michael Marocco                             0                            0%                            0%
John Kornreich                              0                            0%                            0%
Harvey Sandler                              0                            0%                            0%
Andrew Sandler                              0                            0%                            0%
Barry Fingerhut                       1,050,000(3)(4)                   4.2%                          4.2%
Irwin Lieber                          1,050,000(3)(4                    4.2%                          4.2%
Woodland Partners                       175,000(2)(4)                   0.7%                          0.7%
Wheatley Partners II, L.P.            1,050,000(3)                      4.2%                          4.2%
Applewood Capital Corp.               1,050,000(3)(4)                   4.2%                          4.2%
Seth Lieber                           1,050,000(3)(4)                   4.2%                          4.2%
Jonathan Lieber                       1,050,000(3)(4)                   4.2%                          4.2%

</TABLE>
- --------
(2)  Includes  175,000  shares of Common Stock  issuble upon the exercise of the
     options held by Barry Rubenstein.

(3)  Includes  1,050,000  shares of Common Stock owned by Wheatley  Partners II,
     L.P.

(4)  The reporting person disclaims  beneficial  ownership of these  securities,
     except to the extent of his/her/its equity interest therein.


                                 Page 27 of 40
<PAGE>


<TABLE>
<CAPTION>
                                       Shares of                                              Percentage of Shares
                                      Common Stock               Percent of Voting               of Common Stock
            Name                   Beneficially Owned                 Control                  Beneficially Owned
- ------------------------------     ------------------            -----------------            --------------------
<S>                                    <C>                               <C>                           <C>
Marilyn Rubenstein                     175,000(2),(4)                    0.7%                          0.7%
The Marilyn and Barry                  175,000(2),(4)                    0.7%                          0.7%
    Rubenstein Family
    Foundation
Douglas Schimmel                            0                            0%                            0%
Hannah Stone                                0                            0%                            0%
David Lee                                   0                            0%                            0%
Edward Grinacoff                            0                            0%                            0%

</TABLE>

     (b) Barry  Rubenstein  has sole  power to vote and to  dispose  of  175,000
shares of Common Stock  (consisting of 125,000 shares issuable upon the exercise
of the Non-Qualified  Option and 50,000 shares issuable upon the exercise of the
Option),  representing  approximately  0.7% of the outstanding  Common Stock. By
virtue  of  being a  general  partner  of  Wheatley  Partners  II,  L.P.,  Barry
Rubenstein may be deemed to have shared power to vote and to depose of 1,050,000
shares of  Common  Stock,  representing  approximately  4.2% of the  outstanding
Common Stock.

     The Fund may be  deemed  to have  shared  power to vote and to  dispose  of
175,000 shares of Common Stock  (consisting of 125,000 shares  issuable upon the
exercise  of the  Non-Qualified  Option  and  50,000  shares  issuable  upon the
exercise of the  Option),  representing  approximately  0.7% of the  outstanding
Common Stock.

     Seneca may be deemed to have shared power to vote and to dispose of 175,000
shares of Common Stock  (consisting of 125,000 shares issuable upon the exercise
of the Non-Qualified  Option and 50,000 shares issuable upon the exercise of the
Option), representing approximately 0.7% of the outstanding Common Stock.

     Woodland  Services  Corp. may be deemed to have shared power to vote and to
dispose of 175,000 shares of Common Stock (consisting of 125,000 shares issuable
upon the exercise of the  Non-Qualified  Option and 50,000 shares  issuable upon
the exercise of the Option),  representing approximately 0.7% of the outstanding
Common Stock.

     By virtue of being a general partner of Wheatley  Partners II, L.P.,  Barry
Fingerhut may be deemed to have shared power to vote and to dispose of 1,050,000
shares of  Common  Stock,  representing  approximately  4.2% of the  outstanding
Common Stock.


                                 Page 28 of 40
<PAGE>


     By virtue of being a general partner of Wheatley  Partners II, L.P.,  Irwin
Lieber may be deemed to have  shared  power to vote and to dispose of  1,050,000
shares of  Common  Stock,  representing  approximately  4.2% of the  outstanding
Common Stock.

     Wheatley  Partners  II,  L.P.  has sole  power to vote  and to  dispose  of
1,050,000  shares  of  Common  Stock,  representing  approximately  4.2%  of the
outstanding Common Stock.

     By virtue of being a general  partner of Wheatley  Partners  II,  L.P.,  AC
Corp.  may be deemed to have  shared  power to vote and to dispose of  1,050,000
shares of  Common  Stock,  representing  approximately  4.2% of the  outstanding
Common Stock.

     By virtue of being a general  partner of Wheatley  Partners II, L.P. and an
officer of AC Corp.,  Seth Lieber may be deemed to have shared power to vote and
to dispose of 1,050,000 shares of Common Stock, representing  approximately 4.2%
of the outstanding Common Stock.

     By virtue of being a general  partner of Wheatley  Partners II, L.P. and an
officer of AC Corp.,  Jonathan Lieber may be deemed to have shared power to vote
and to dispose of 1,050,000 shares of Common Stock,  representing  approximately
4.2% of the outstanding Common Stock.

     Woodland Partners may be deemed to have shared power to vote and to dispose
of 175,000 shares of Common Stock  (consisting  of 125,000 shares  issuable upon
the exercise of the  Non-Qualified  Option and 50,000  shares  issuable upon the
exercise of the  Option),  representing  approximately  0.7% of the  outstanding
Common Stock.

     By virtue of being the wife of Barry Rubenstein,  Marilyn Rubenstein may be
deemed to have shared  power to vote and to dispose of 175,000  shares of Common
Stock   (consisting  of  125,000  shares  issuable  upon  the  exercise  of  the
Non-Qualified  Option  and  50,000  shares  issuable  upon the  exercise  of the
Option), representing approximately 0.7% of the outstanding Common Stock.

     The Foundation may be deemed to have shared power to vote and to dispose of
175,000 shares of Common Stock  (consisting of 125,000 shares  issuable upon the
exercise  of the  Non-Qualified  Option  and  50,000  shares  issuable  upon the
exercise of the  Option),  representing  approximately  0.7% of the  outstanding
Common Stock.

     (c) The following is a description of all transactions in the securities of
the Issuer by the persons  identified  in Item 2 of this  Schedule  13D effected
from January 7, 2000 through March 24, 2000, inclusive:


                            Date Purchased     Number of Shares        Price Per
Name of Shareholder         (Sold)             Purchased or (Sold)         Share
- -------------------         --------------     -------------------     ---------
Barry Rubenstein            3/3/00               (37,500)              $  6.0625
Barry Rubenstein            3/8/00               (50,500)              $  5.9375
Rollover IRA


                                 Page 29 of 40
<PAGE>


<TABLE>
<CAPTION>
                                  Date Purchased       Number of Shares                   Price Per
Name of Shareholder               (Sold)               Purchased or (Sold)                    Share
- ------------------------------    --------------       ------------------                 ---------
<S>                               <C>                       <C>                        <C>
Woodland Venture Fund             3/3/00                    (150,000)                  $     6.0625
Seneca Ventures                   3/3/00                     (50,000)                  $     6.0625
Irwin Lieber                      1/11/00                     (6,000)                  $     7.5625
Barry Fingerhut                   3/20/00                     (1,000)                  $       6.00
21st Century Communications
Partners, L.P.                    2/11/00                   (442,438)                  $       6.50
                                  2/11/00                    (25,696)                  $      6.875
                                  2/11/00                    (42,107)                  $      6.875
                                  2/11/00                    (81,363)                  $     6.8125
                                  2/16/00                   (216,969)                  $      6.125
                                  2/18/00                   (237,310)                  $    6.09375
                                  2/22/00                    (77,973)                  $    6.03125
                                  2/28/00                    (67,803)                  $     6.1875
                                  3/3/00                    (203,409)                  $    6.03125
                                  3/8/00                     (67,803)                  $      5.875
                                  3/9/00                     (67,803)                  $     5.8125
                                  3/17/00                   (322,064)                  $      6.125
                                  3/20/00                   (135,606)                  $      5.875
                                  3/22/00                   (173,890)                  $      5.375
21st Century Communications
T-E Partners, L.P.                2/11/00                   (149,949)                  $       6.50
                                  2/11/00                    (13,155)                  $      6.875
                                  2/11/00                     (9,914)                  $      6.875
                                  2/11/00                    (27,683)                  $     6.8125
                                  2/16/00                    (73,821)                  $      6.125
                                  2/18/00                    (80,742)                  $    6.09375
                                  2/22/00                    (26,530)                  $    6.03125
                                  2/2800                     (23,069)                  $     6.1875
                                  3/3/00                     (69,207)                  $    6.03125
                                  3/8/00                     (23,069)                  $      5.875
                                  3/9/00                     (23,069)                  $     5.8125

</TABLE>



                                 Page 30 of 40
<PAGE>


<TABLE>
<CAPTION>
                                  Date Purchased       Number of Shares                   Price Per
Name of Shareholder               (Sold)               Purchased or (Sold)                    Share
- ------------------------------    --------------       ------------------                 ---------
<S>                               <C>                       <C>                        <C>
                                  3/17/00                   (109,578)                  $      6.125
21st Century Communications
T-E Partners, L.P.                3/20/00                    (46,138)                  $      5.875
                                  3/22/00                    (64,180)                  $      5.375
21st Century Communications
Foreign Partners, L.P.            2/11/00                    (57,613)                  $       6.50
                                  2/11/00                     (9,128)                  $      6.875
                                  2/11/00                    (10,954)                  $     6.8125
                                  2/16/00                    (29,210)                  $      6.125
                                  2/18/00                    (31,948)                  $    6.09375
                                  2/22/00                    (10,497)                  $    6.03125
                                  2/28/00                     (9,128)                  $     6.1875
                                  3/3/00                     (27,384)                  $    6.03125
                                  3/8/00                      (9,128)                  $      5.875
                                  3/9/00                      (9,128)                  $     5.8125
                                  3/17/00                    (43,358)                  $      6.125
                                  3/20/00                    (18,256)                  $      5.875
                                  3/22/00                    (19,881)                  $      5.375
Wheatley Partners II, L.P.        1/13/00                    (33,000)                  $       7.00
                                  2/24/00                    (55,000)                  $     6.8125
                                  2/24/00                   (250,000)                  $      6.875
                                  2/24/00                    (85,000)                  $       7.00
                                  2/29/00                   (265,000)                  $       6.00
                                  3/8/00                    (200,000)                  $      5.875
                                  3/9/00                    (150,000)                  $     5.8125
                                  3/17/00                   (350,000)                  $      6.125
                                  3/20/00                    (25,000)                  $      5.875
                                  3/24/00                   (125,000)                  $     5.8125
</TABLE>

     All  sales  of  shares  of  Common  Stock  were  effected  in  open  market
transactions in the over-the-counter market.







                                 Page 31 of 40
<PAGE>


     (d) No other  person  has the right to  receive  or the power to direct the
receipt of dividends from, or the proceeds from the sale of such securities.

     (e)  Effective  March 24,  2000,  the  reporting  persons  ceased to be the
beneficial  owners of more than five  percent  (5%) of the  Common  Stock of the
Issuer.

ITEM 7. Material to be Filed as Exhibits.

     Exhibit  7.01  Agreement  effective  as of  February  11,  2000  among  the
reporting  persons by which they have agreed to file this  Schedule  13D and all
necessary amendments, as required by Rule 13d-1.







                                 Page 32 of 40
<PAGE>


                                    Signature

     After  reasonable  inquiry and to the best of their  knowledge  and belief,
each of the undersigned  hereby certifies that the information set forth in this
Schedule is true, complete, and correct.

Date:    April 6, 2000                      SENECA VENTURES

                                            /s/Barry Rubenstein
                                            -----------------------------------
                                            Barry Rubenstein,
                                            A General Partner


                                            WOODLAND VENTURE FUND

                                            /s/Barry Rubenstein
                                            -----------------------------------
                                            Barry Rubenstein,
                                            A General Partner


                                            WOODLAND SERVICES CORP.

                                            /s/Barry Rubenstein
                                            -----------------------------------
                                            Barry Rubenstein,
                                            President


                                            WOODLAND PARTNERS

                                            /s/Barry Rubenstein
                                            -----------------------------------
                                            Barry Rubenstein,
                                            A General Partner


                                            WHEATLEY PARTNERS II, L.P.

                                            /s/Irwin Lieber
                                            -----------------------------------
                                            Irwin Lieber,
                                            A General Partner


                                            APPLEWOOD CAPITAL CORP.

                                            /s/Irwin Lieber
                                            -----------------------------------
                                            Irwin Lieber,
                                            Secretary and Treasurer


                                            /s/Barry Rubenstein
                                            -----------------------------------
                                            Barry Rubenstein


                                            /s/Barry Fingerhut
                                            -----------------------------------
                                            Barry Fingerhut



                                 Page 33 of 40
<PAGE>



                                            /s/Irwin Lieber
                                            -----------------------------------
                                            Irwin Lieber



                                            /s/Jonathan Lieber
                                            -----------------------------------
                                            Jonathan Lieber



                                            /s/Seth Lieber
                                            -----------------------------------
                                            Seth Lieber



                                            /s/Marilyn Rubenstein
                                            -----------------------------------
                                            Marilyn Rubenstein



                                            THE MARILYN AND BARRY
                                            RUBENSTEIN FAMILY
                                            FOUNDATION


                                            By: /s/  Barry Rubenstein
                                                -------------------------------
                                                Barry Rubenstein, a Trustee




                                 Page 34 of 40
<PAGE>



                       21ST CENTURY COMMUNICATIONS PARTNERS, L.P.

                         By: Sandler Investment Partners, L.P., general partner
                         By: Sandler Capital Management, general partner
                             By: ARH Corp., a general partner


                                        By:/s/Edward Grinacoff
                                           -------------------------------------
                                           Name:  Edward Grinacoff
                                           Title: Secretary and Treasurer




                       21ST CENTURY COMMUNICATIONS T-E PARTNERS, L.P.

                         By: Sandler Investment Partners, L.P., general partner
                         By: Sandler Capital Management, general partner
                             By: ARH Corp., a general partner


                                        By:/s/Edward Grinacoff
                                           -------------------------------------
                                           Name:  Edward Grinacoff
                                           Title: Secretary and Treasurer




                       21ST CENTURY COMMUNICATIONS FOREIGN PARTNERS, L.P.

                         By: Sandler Investment Partners, L.P., general partner
                         By: Sandler Capital Management, general partner
                             By: ARH Corp., a general partner


                                        By:/s/Edward Grinacoff
                                           -------------------------------------
                                           Name:  Edward Grinacoff
                                           Title: Secretary and Treasurer






                                 Page 35 of 40
<PAGE>



                                               /s/Michael J. Marocco
                                               ------------------------------
                                               Michael J. Marocco



                                               /s/John Kornreich
                                               ------------------------------
                                               John Kornreich



                                               /s/Harvey Sandler
                                               ------------------------------
                                               Harvey Sandler



                                               /s/Andrew Sandler
                                               ------------------------------
                                               Andrew Sandler



                                               /s/Douglas Schimmel
                                               ------------------------------
                                               Douglas Schimmel



                                               /s/Hannah Stone
                                               ------------------------------
                                               Hannah Stone



                                               /s/David Lee
                                               ------------------------------
                                               David Lee



                                               /s/ Edward Grinacoff
                                               ------------------------------
                                               Edward Grinacoff



ATTENTION:  INTENTIONAL  MISSTATEMENTS  OR OMISSIONS OF FACT CONSTITUTE  FEDERAL
CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).






                                 Page 36 of 40



                                                                    Exhibit 7.01


                             JOINT FILING AGREEMENT

     In accordance with Rule 13d-1 under the Securities Exchange Act of 1934, as
amended,  the undersigned  hereby agree to the joint filing on behalf of each of
them of a statement on Schedule 13D (including  amendments thereto) with respect
to the  Common  Stock,  par  value  $0.01 per  share,  of  CORNERSTONE  INTERNET
SOLUTIONS CO. and that this  Agreement be filed as an Exhibit to such  statement
on Schedule 13D.

     IN WITNESS WHEREOF, the undersigned hereby execute this Agreement effective
as of the 11th day of February, 2000.

                                                    SENECA VENTURES

                                                    /s/Barry Rubenstein
                                                    ----------------------------
                                                    Barry Rubenstein,
                                                    A General Partner


                                                    WOODLAND VENTURE FUND

                                                    /s/Barry Rubenstein
                                                    ----------------------------
                                                    Barry Rubenstein,
                                                    A General Partner


                                                    WOODLAND SERVICES CORP.

                                                    /s/Barry Rubenstein
                                                    ----------------------------
                                                    Barry Rubenstein,
                                                    President


                                                    WOODLAND PARTNERS

                                                    /s/Barry Rubenstein
                                                    ----------------------------
                                                    Barry Rubenstein,
                                                    A General Partner


                                                    WHEATLEY PARTNERS II, L.P.

                                                    /s/Irwin Lieber
                                                    ----------------------------
                                                    Irwin Lieber,
                                                    A General Partner



                                 Page 37 of 40
<PAGE>



                                                    APPLEWOOD CAPITAL CORP.


                                                    /s/Irwin Lieber
                                                    ----------------------------
                                                    Irwin Lieber,
                                                    Secretary and Treasurer


                                                    /s/Barry Rubenstein
                                                    ----------------------------
                                                    Barry Rubenstein


                                                    /s/Barry Fingerhut
                                                    ----------------------------
                                                    Barry Fingerhut


                                                    /s/Irwin Lieber
                                                    ----------------------------
                                                    Irwin Lieber


                                                    /s/Jonathan Lieber
                                                    ----------------------------
                                                    Jonathan Lieber


                                                    /s/Seth Lieber
                                                    ----------------------------
                                                    Seth Lieber


                                                    /s/Marilyn Rubenstein
                                                    ----------------------------
                                                    Marilyn Rubenstein


                                                    THE MARILYN AND BARRY
                                                    RUBENSTEIN FAMILY
                                                     FOUNDATION

                                                    By: /s/  Barry Rubenstein
                                                    ----------------------------
                                                     Barry Rubenstein, a Trustee





                                 Page 38 of 40
<PAGE>



                       21ST CENTURY COMMUNICATIONS PARTNERS, L.P.


                       By: Sandler Investment Partners, L.P., general partner
                       By: Sandler Capital Management, general partner
                       By: ARH Corp., a general partner


                                     By:/s/Edward Grinacoff
                                        ---------------------------------------
                                        Name:  Edward Grinacoff
                                        Title: Secretary and Treasurer



                       21ST CENTURY COMMUNICATIONS T-E PARTNERS, L.P.

                       By:  Sandler Investment Partners, L.P., general partner
                       By:  Sandler Capital Management, general partner
                       By:  ARH Corp., a general partner


                                     By:/s/Edward Grinacoff
                                        ---------------------------------------
                                        Name:  Edward Grinacoff
                                        Title: Secretary and Treasurer



                       21ST CENTURY COMMUNICATIONS FOREIGN PARTNERS, L.P.

                       By: Sandler Investment Partners, L.P., general partner
                       By: Sandler Capital Management, general partner
                       By: ARH Corp., a general partner


                                     By:/s/Edward Grinacoff
                                        ---------------------------------------
                                        Name:  Edward Grinacoff
                                        Title: Secretary and Treasurer



                                 Page 39 of 40
<PAGE>



                                                /s/Michael J. Marocco
                                                --------------------------------
                                                Michael J. Marocco



                                                /s/John Kornreich
                                                --------------------------------
                                                John Kornreich



                                                /s/Harvey Sandler
                                                --------------------------------
                                                Harvey Sandler



                                                /s/Andrew Sandler
                                                --------------------------------
                                                Andrew Sandler



                                                /s/Douglas Schimmel
                                                --------------------------------
                                                Douglas Schimmel



                                                /s/Hannah Stone
                                                --------------------------------
                                                Hannah Stone



                                                /s/David Lee
                                                --------------------------------
                                                David Lee



                                                /s/ Edward Grinacoff
                                                --------------------------------
                                                Edward Grinacoff




ATTENTION:  INTENTIONAL  MISSTATEMENTS  OR OMISSIONS OF FACT CONSTITUTE  FEDERAL
CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001).




                                 Page 40 of 40




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