SS$_NORMAL         Returned value terminated by a blank or an
                       end-of-line. This shows that the value is the
                       last, or only, value in the list.
    CLI$_ABSENT        No value returned. The value is not present,
                       or the last value in the list was already
                       returned.
    CLI$_COMMA         Returned value terminated by a comma. This
                       shows there are additional values in the list.
    CLI$_CONCAT        Returned value concatenated to the next
                       value with a plus sign. This shows there are
                       additional values in the list.
    CLI$_INVREQTYP     Calling process did not have a CLI to perform
                       this function or the CLI did not support the
                       request.