SS$_NORMAL         Successful completion. The user format routine
                       has completed the function that the symbiont
                       requested.
    PSM$_FUNNOTSUP     Function not supported. The user format
                       routine does not support or does not recognize
                       the function code supplied by the symbiont.
                       To ensure future compatibility, your format
                       routine should return this status for any
                       unrecognized status codes.

    This routine also returns any error condition values that you
    have coded your format routine to return.