SET S-WRITE-FUNCTION TO TRUE  CALL "S$IO" USING SIO-FUNCTION                    f                    recBuffer                    lenght             GIVING returnCode  | 
f  | 	the file handle returned by S-OPEN-FUNCTION.  | |
recBuffer  | an alphanumeric data-item that contains the record to write.  | |
length  | number of bytes to write.  If zero, then the maximum record size for the file is used.   | |
>0   | Operation successful.  | 
0  | Operation failed.  |