This routine calls CLI$DCL_PARSE to establish a command table and
    a command to parse. It then calls TPU$PARSEINFO to build an item
    list for TPU$INITIALIZE.

    If your application parses information that is not related to the
    operation of DECTPU, make sure the application obtains and uses
    all non-DECTPU parse information before the application calls
    TPU$CLIPARSE. You must do this because TPU$CLIPARSE destroys all
    parse information obtained and stored before TPU$CLIPARSE was
    called.