ATTRDPN

The CICS® transaction specifies the return destination process name (ATTRDPN) in the RPROCESS field of the BUILD ATTACH command.

When CICS sends this field to IMS, it contains the code of a transaction to be executed in the event that a session restart is required or a reply is to be returned to a message that CICS sent to IMS using SEND LAST. IMS sends this to CICS when a next MID is specified within an MFS message output descriptor (MOD). When CICS receives the ATTRDPN field on an input message, it can be examined by the EXTRACT ATTACH command. This value should be saved and returned to IMS as the DPN on subsequent replies.