As well as defining permanent message processing regions, as described in the section Adding a Message Processing Region to a Resource Group in the chapter Configuring IMS-enabled Enterprise Servers , you can define temporary ones that exist only until an enterprise server is stopped.
To start a temporary MPR:
The IMS Control page that appears is for starting MPRs and creating an internal diagnostic view of IMS TM message queues.
The MPR starts immediately and lasts until the enterprise server is stopped.
Like all SEPs, any MPRs you define are shown, together with their statuses, on the SEPs page in ESMAC. Click SEPs near the top left of the ESMAC menu to display this. MPRs are displayed in the IMS MPR section.