Table13 describes each stage of the interface between the task-related user exitand EDF,relating the descriptions to the (T
n
) and (E
n
) expressions in Figure 10.

Table13. Description of each stage of the task-related user exit/EDF interface

Invocation Description
(T1) Task-relateduser exit invoked to set up its EDF requirements. At this
stage the task-related user exit prepares the “About to Execute” screen
based on the application request.
(E1) Using information passed back from the task-related user exit at
invocation T1, the task-related user exit interface invokes EDF to display
the “About to Execute” screen. EDF sets up the EDF user response, for
example, if the user has changed the screen.
(T2) Task-relateduser exit is invoked with the EDF user response to the
“About to Execute” screen.
(T3) Task-relateduser exit invoked to access external resource manager for
application request.
(T4) Task-relateduser exit invoked to prepare a “Command Execution
Complete” screen, based on the result of the application request.
(E2) Using information passed back from the task-related user exit at
invocation T4, the task-related user exit interface invokes EDF to display
the “Command Execution Complete” screen. EDF sets up the EDF user
response, for example, if the user has changed the screen.
(T5) Task-relateduser exit is invoked with the EDF user response to the
“Command Execution Complete” screen.
Task-related user
exit interface Task-related user exit (T1)
Prepare 'About to Execute' EDF screen
EDF (E1) Display screen
Task-related user exit (T2)
Response EDF user
Task-related user exit (T3)
Access resource manager
Task-related user exit (T4)
Prepare 'Command Execution Complete' EDF screen
EDF (E2) Display screen
Task-related user exit (T5)
Response EDF user

Figure 10. Interface between the task-related user exit and EDF

the task-related user exit program
Chapter2. Task-related user exit programs 279