Task-related user exit programs

Use a task-related user exit (TRUE) to write your own program to access a resource, such as a database, that is not otherwise available to your CICS® system.

Introduction to the task-related user exit mechanism (the adapter)
You can use a task-related user exit (TRUE) to write your own program to access a resource, such as a database, that would not otherwise be available to your CICS system.
The stub program
The stub program shields application programmers from the mechanics of non-CICS resource managers. It is written in assembler language. After assembly, the stub is link-edited to each application program that wants to use it.
Writing a task-related user exit program
The main function of the task-related user exit program is to translate the calling program's parameters into a form acceptable to your non-CICS resource manager, and then to pass control to the resource manager.
Administering the adapter
Careful use of task-related user exits can allow your application programmers to be unaffected by the invocation of non-CICS resource managers from CICS application programs. Enabling and disabling task-related user exit programs for an installation should be the responsibility of one or more supervisory or main terminal operators.
Adapter tracking sample task-related user exit program (DFH$APDT)
DFH$APDT is a sample task-related user exit (TRUE) program, which contains adapter data fields that you can use for transaction tracking.

Parent topic: Customizing with user exit programs