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# Session

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When you enable a session for change propagation, the session provides discovery and message transport services using either JMS, RMI, or CORBA.

Discovery services ensure that sessions announce themselves to other sessions participating in cache coordination. Discovery services use UDP communication and multicast configuration to monitor sessions as they join and leave the coordinated cache. All coordinated cache types (except JMS) require discovery services.

Message transport services allow the session to broadcast object change notifications to other sessions participating in cache coordination when a unit of work from this session commits a change.