Answer / kavya

Modified Data Tag(MDT)is one bit attribute character.

If it is ON(1)means,it indicates that it is modified by
terminal operator.

FRSET is Field Reset is used in the CNTL parameters of the
map definition (DFHMDI) or mapset definition(DFHMSD).If
CNTL=FRSET,when the map or mapset is sent to the
terminal,MDT will reset to '0' indicating it is not
modified by terminal operator.

FSET is Field set is used in the ATTRB parameters of the
field definition of the BMS maps(DFHMDF).If FSET is
specified in ATTRB parameter of the DFHMDF macro for a
field,when the map is sent to the terminal,MDT will be set
to '1' for the field regardless of whether the field has
been modified by the terminal user.

Following explanation will help you to understand better.
You cannnot assume the terminal user will always type some
data into all unprotected fields.He/she might forget to
type some required fields,or intentionally skip certain
fields.In such cases the program might not get data in the
fields as the program expects.
In order to prevent the troublesome situation, We use the
concept of FSET and FRSET.

Answer / manish_cics

The last bit in the attribute byte , the MDT( Modified data
Tag) , indicates whether the user has modified the data in
the field. to save transmission time , the terminal sends a
field to the CICS program only if its MDT is on. un
modified fields are not transmitted.
HOW TO SET/RESET MDT
there r three ways of setting and resetting MDT , as
follows:
1- when the terminal user modifies a field on a screen ,
MDT 'LL be set "1" (ON) automatically by the terminal
hardware.
2-if CNTL=FRSET is sepecified in the DFHMSD OR DFHMDI
macro , when the mapset or the map is sent to the
terminal , MDT will be reset to "0" ( OFF ie not modified )
for all fields of the mapset or the map , respectively.
3- further , if FSET is specified in the ATTRB parameter of
the DFHMDF macro for a field , when the map is sent to the
terminal , MDT will be set to "1" ( on , i.e. modified) for
the field , regardless of whether the field has been
modified by the terminal user.

the following technique shud be used:
. code CNTL=FRSET in DFHMSD or DFHMDI.
. CODE ATTRB=(FSET,..) IN all DFHMDF macros for the
fields , from which the application program expects to
receive data , regardless of whether they r input fields or
output fields .

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