EXHIBIT B JOINT FILING AGREEMENT The undersigned hereby agree that Amendment No. 2 to the statement on Schedule 13D with respect to the shares of Common Stock of Northstar Health Services, Inc., dated February 21, 1997, and any further amendments...

1


                                    EXHIBIT B

                             JOINT FILING AGREEMENT

                  The  undersigned  hereby  agree  that  Amendment  No. 2 to the
statement  on  Schedule  13D with  respect  to the  shares  of  Common  Stock of
Northstar  Health  Services,  Inc.,  dated  February 21,  1997,  and any further
amendments thereto signed by each of the undersigned shall be filed on behalf of
each of them pursuant to and in accordance  with the provisions of Rule 13d-1(f)
under the Securities Exchange Act of 1934.

Date:  February 21, 1997        XXXXXX X. XXXXXX



                                /s/ Xxxxxx X. Xxxxxx
                                Xxxxxx X. Xxxxxx


Date:  February 21, 1997        XXXXXX X. XXXXXXXX



                                /s/ Xxxxxx X. Xxxxxxxx
                                Xxxxxx X. Xxxxxxxx


Date:  February 21, 1997        XXXXX X. XXXXXXXX



                                /s/ Xxxxx X. Xxxxxxxx
                                Xxxxx X. Xxxxxxxx


Date:  February 21, 1997        COMMONWEALTH ASSOCIATES, L.P.

                                By:  Commonwealth Associates Management
                                       Company, Inc., its general partner


                                By:  /s/ Xxxxx Xxxxxxxx
                                    Name:  Xxxxx Xxxxxxxx
                                    Title: Chief Operating Officer


                                By:  /s/ Xxxxxx Xxxxx
                                    Name:  Xxxxxx Xxxxx
                                    Title: Chief Financial Officer