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

 language

    OpenVMS usage:char_string
    type:         character string
    access:       write only
    mechanism:    by descriptor

    Receives the translation of SYS$LANGUAGE. The language argument
    is the address of a descriptor pointing to this language name.