(1) An indicator, associated with each input or output field in a displayed record, that is automatically set on when data is typed into the field. The modified data tag is maintained by the display file and can be used by the program using the file.
(2) In the attribute byte of each field in a BMS map, a bit that determines whether the field should be transmitted on a READ MODIFIED command (the command used by CICS for all except copy operations).