/HELP_LIBRARY=file-spec
       /NOHELP_LIBRARY

    Specifies the HELP library where you can find help text for
    placeholders and tokens defined in this language. LSE applies
    the default file specification SYS$HELP:HELPLIB.HLB. If you want
    to access some HELP library other than SYS$HELP, you must supply
    an explicit device name.