Which log file contains system-level messages?

What could be a reason for a program not launching after installation?

An administrator notices that the Message Driven Beans (MDBs) are slow to complete, and decides to increase the 'Maximum concurrent MDB invocations per endpoint'. Which thread pool should be tuned to ensure it can run the maximum number of MDBs without waiting?

A administrator has received complaints from users of an application about sessions expiring frequently and forcing user to login multiple times. What options in http plugin-cfg.xml can be used to verify that session affinity is working correctly?

Which memory to memory session persistence configuration should be used to minimize session data loss during fail-over?