EXHIBIT 21


                           SUBSIDIARIES OF REGISTRANT

    SnapTrack, Inc. (SnapTrack), a California corporation, is a wholly owned
subsidiary of the Company. SnapTrack does business under its own name. The
Company consolidates SnapTrack in its financial statements.

    The names of other subsidiaries are omitted. Such subsidiaries would not, if
considered in the aggregate as a single subsidiary, constitute a significant
subsidiary within the meaning of Item 601(b)(21)(ii) of Regulation S-K.