The message queues also makes sure that a message instruction is only processed once (unless a transaction rollback occurs - see Transaction Management of Messages) and is processed even if system resources fail because it is retried when the system is running again. For example, in the case for banking transactions, a message to update a bank account must only be performed once and must be performed at some point even if the system has failed.
You can dynamically configure the Mbox sets using the SWDIR\
util\
swadm utility. For example, you can create Mbox sets, add queues to Mbox sets and remove queues.
The process_attribute table specifies the access type for each process and which Mbox set is used.