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

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

    The relative position in the source string of the first unequal
    character. LIB$SKPC returns a zero if the source string was of
    zero length or if every character in source-string was equal to
    character-string.