VMS Help System Services, $SAVE VP EXCEPTION (VAX Only), Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 excid

    OpenVMS usage:context
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference
    Internal ID of the exception state saved by $SAVE_VP_EXCEPTION.
    The excid argument is the address of a longword containing this
    ID.