ATTDQN and ATTDP

When sent to CICS® from IMS, on the ATTACH for a demand-paged output message, ATTDQN contains a unique message identifier.

This field is only used for IMS demand paging. The CICS transaction specifies the destination message ID (ATTDQN) for subsequent demand-paged requests as the QNAME value in the returned QMODEL FM header. When CICS receives ATTDQN from IMS, the ATTDP field is set to 1. These fields are not set by IMS on any other conditions nor are they accepted by IMS on input.