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

    OpenVMS usage:longword_unsigned
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

    Result of raising an unsigned longword integer base to an
    unsigned longword integer exponent.