Use of KieSession for executing process instances in jBPM 6 clustered environment

Issue

There is a scenario where an application which has jBPM 6 as embedded libraries in a clustered environment (i.e. application itself is deployed on a clustered set-up of BRMS installation) . In such a set-up, some queries like the following could arise regarding the use of KieSession for executing process instances.

• Could the same KieSession be run on multiple nodes?
• Could the processes be run in a KieSession other than the one which started them ? Precisely speaking, can processes containing Human Tasks switch between KieSessions? The processSessionId column on the Task DB table suggests that they can't.
• Will process timers work properly if the process switches between KieSessions?
• What mechanisms does jBPM 6 offer to coordinate processes in a cluster? How should the process instance being prevented from being run on multiple nodes if the processes are not linked to a specific user session?
• Can events/messages be sent between processes running on different nodes?