VMS Help RTL Routines, LIB$, LIB$CALLG_64, Returns  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    OpenVMS usage:quadword_unsigned
    type:         quadword (unsigned)
    access:       write only
    mechanism:    by value

    Return value, if any, of the called routine, unchanged by
    LIB$CALLG_64.