VMS Help RTL Routines, LIB$, LIB$BBCCI, 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

    State of the bit before it was cleared by LIB$BBCCI: 1 if the bit
    was previously set, and 0 if the bit was previously clear.