What is MDT? What are FSET, FRSET?

CICS Interview Questions

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What is MDT? What are FSET, FRSET?

MDT: Bit in the attribute byte indicating modification of field on screen. Happens on an input operation.
FSET: Sets MDT on to ensure field is transmitted. Happens on an output operation
FRSET: Reset MDT. Until this happens, field continues to be sent.

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