Shutting down Websphere

What is the sequence of events that occurs when WAS receives a shutdown command Specifically what happens to any PRPC threads that may be currently running - for example to create a new work object from a SWIFT message that has just been taken from an MQ listener. Does the WAS wait until all threads under its control complete or do all running threads simply get killed. If the latter, then what happens to the MQ message, does this persist on MQ or is it potentially lost. Operationally one of our Clients wants to know the preferred sequence for shutting down the WAS - what, if anything needs to happen outside of the WAS prior to the shutdown command to WAS being entered. How can orderly shutdown be accomplished such that no loss of data occurs

***Updated by moderator: Marissa to close post***
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