/sys$common/syshlp/helplib.hlb HELP, /MESSAGE, Qualifiers, /STATUS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    /STATUS=status-code
    /STATUS='symbol'
    /STATUS='$STATUS' (default)

    Outputs the message corresponding to the specified status code.
    You can specify the status code with a decimal or hexadecimal
    number or a symbol enclosed in apostrophes.

    If a HELP/MESSAGE command does not include a search string, Help
    Message by default outputs the message corresponding to the CLI
    symbol $STATUS; that is, Help Message displays information on how
    the last executed command completed.

    You cannot specify a search string or /FACILITY with /STATUS.
    /FACILITY is also illegal if you omit the search string and
    default to /STATUS='$STATUS'.