SET S-REWRITE-FUNCTION TO TRUE  CALL "S$IO" USING SIO-FUNCTION                     f                    recBuffer                    lenght             GIVING returnCode  | 
f  | 	the file handle returned by R-OPEN-FUNCTION.  | |
recBuffer  | an alphanumeric data-item that contains the new record data.  | |
length  | number of bytes to write. It may be zero to indicate the maximum record size for the file. The size of the new record need not match the size of the existing record.   | |
>0   | Operation successful.  | 
0  | Operation failed.  |