The TYPE=DSECT assembly is used to produce a series of data structures, collectively called the symbolic map set. ... CICS® uses it at execution time for constant fields and to determine how to merge in the variable data from the program.

What is meant by Mapset in CICS?

A collection of screens is called a mapset. Both physical (used primarily by CICS) and logical or symbolic maps (used primarily by the application program) must be created. To create the original map definition, CICS provides assembler-language macros for use under BMS.

What is the use of Dfhmdf macro do?

The DFHMDF macro allows the field names length to be from 1 through 30 characters. DFHMDF appending one of several additional characters(Length(L), flag(F), attribute(A), input(I) and output(O)) to derived name to generate a symbolic description map.