Name                                 Position
           ----                                 --------

John C. Malone             Has served as Chairman of the Board and a director of
Born March 7, 1941         the Company since December 1996. Has served as Chief
                           Executive Officer of TCI since January 1994, and as
                           Chairman of the Board of TCI since November 1996. Dr.
                           Malone served as President of TCI from January 1994
                           to March 1997, as Chief Executive Officer of TCIC
                           from March 1992 to October 1994 and as President of
                           TCIC from 1973 to October 1994. Dr. Malone has also
                           served as Chairman of the Board and as a director of
                           Tele-Communications International, Inc. since May
                           1995. Dr. Malone is also a director of TCI, TCIC, TCI
                           Pacific Communications, Inc., The Bank of New York,
                           At Home Corporation, Lenfest Communications, Inc.,
                           Cablevision Systems Corporation and PRIMESTAR.


Gary S. Howard             Has served as Chief Executive Officer of the Company
Born February 22, 1951     since December 1996 and a director of the Company
                           since November 1996. From February 1995 through
                           August 1997, Mr. Howard also served as President of
                           the Company. Mr. Howard is also currently an
                           executive officer of TCI and various subsidiaries of
                           TCI. Mr. Howard served as Senior Vice President of
                           TCIC from October 1994 to December 1996, and as Vice
                           President of TCIC from December 1991 through October
                           1994. Mr. Howard is also a director of United Video
                           Satellite Group, Inc. ("UVSG"), Telewest
                           Communications plc and PRIMESTAR.


David P. Beddow            Has served as a director of the Company since
Born December 27, 1943     December 1996. Mr. Beddow has served as Executive
                           Vice President of TCIC and President and Chief
                           Executive Officer of NDTC since August 1998. Prior to
                           August 1998, Mr. Beddow served as Senior Vice
                           President of TCITV and NDTC since February 1995. Mr.
                           Beddow served as Vice President of TCI Technology,
                           Inc. from June 1993 to February 1995.


William E. Johnson         Has served as a director of the Company since
Born June 23, 1941         December 1996. Mr. Johnson served as Chief Executive
                           Officer of Scientific Atlanta, Inc. from January 1987
                           until his retirement in December 1992. Mr. Johnson
                           served as a director of Intelligent Electronic, Inc.
                           from November 1994 to 1998 and as a director of ATX,
                           Inc. since January 1993.