EDF and DTP programs

You can test a transaction that is using distributed transaction processing (DTP) across a remote link by telling execution diagnostic facility (EDF) to monitor the session on the link.

You can do this on either (or both) of the participating systems that are running under CICS and have EDF installed. You cannot do this if the transaction has been routed from another CICS region because you must use single-screen mode for remote transactions.

For APPC and MRO links, you can name the system identifier of the remote system:

CEDF sysid

This causes EDF to associate itself with any transaction attached across any session belonging to the specified system.

For APPC, MRO, and LU6.1 links, you can use the session identifier that the transaction is using:

CEDF sessionid

You can determine the session identifier with the INQUIRE TERMINAL command, but this means that the transaction must be running and must have reached the point of establishing a session before you start EDF.

If a transaction that uses distributed transaction processing also has a terminal associated with it, or if you can invoke it from a terminal (even though it does not use one), you can use EDF to test it in the usual way from that terminal.

When you have finished testing the transaction on the remote system, turn off EDF on that system identifier or session identifier before logging off from CICS with CESF. For example:

CEDF sysid,OFF

Failure to turn off EDF could cause another transaction that is using a link to that system to be suspended.

EDF and distributed program link commands

You can use EDF, in single- or dual-terminal mode, to test a transaction that includes a distributed program link (DPL) command. However, EDF displays only the DPL command invocation and response screens. CICS commands issued by the remote program are not displayed, but a remote abend, and the message a remote abend has occurred, is returned to the EDF terminal, along with the system identifier of the system from which the abend was received. After control is returned to your local program, EDF continues to test as normal, but the program status word (PSW) is not displayed if the abend is in a remote program.