Answer Posted / khader
MDT is modified data tag.
MDT is one bit of the attribute character.
MDT is off(0), it indicates that this field has not been
modified by the terminal operator.
MDT is on(1), it indicates that this field by the
terminatal operator.
FSET is field set. MDT will be set on(set to 1) regardless
of whether the terminal operator modified the data or not.
FRSET is to reset MDT to zero.
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