Answer / amarnadh reddy

Hi,

Modified Data Tag is used data transfer from a terminal to
the application program. MDT is 1 bit of attribute character.
MDT can be set CTRL=FRSET in DFHMSD will reset the MDT to
OFF(means 0), that this field is not modified.
MDT cab be set ATTRIB=FSET will reset the MDT to ON(means
1), this field is modified.

Answer / petchiammal

MDT indicates whether a field is modified or not
MDT on will ensure that data is received into the program

MDTs can be turned on by
Specifying the FSET attribute in the physical map
Setting the attribute byte to FSET in the symbolic map
Keying data into the field

Answer / mainframe.rahulz

Modified Data Tag is used in order to avoid a problem called
"MAP FAIL ERROR"
MDT is used to set the attribute field of a named field.

we can use MDT in 2 ways.

1. by using Assembler Macro.
2. By using Application program.

By using Assembler Macro

use DFHMSD CNTL=(FRSET,...
and in DFHMDF ATTRB=(FSET,...

By using Application program
MOVE DFHBMSFRS TO FIELD+F
MOVE DFHBMSFSE TO FIELD+F

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