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

    OpenVMS usage:longword_signed
    type:         longword (signed)
    access:       write only
    mechanism:    by value

    Result of raising a signed longword base to a signed longword
    exponent.