PoolClass vs. maxSession for MDB in JBoss EAP

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Issue

We'd like to better understand the relationship between the class annotation @PoolClass and the @MessageDriven(@ActivationConfigProperty maxSession) for configuring an MDB.
What is difference between maxSession and maxSize for MDB instances/pool?

Environment

Red Hat JBoss Enterprise Application Platform (EAP)
- 4.3
- 5

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