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[xmlblaster] question about queue in xmlBlaster

Question 1:
1. run the "java HelloWorldPublish -numPublish 100 -persistent true" command, and then in the XB_ENTRIES , there are two queues: msgUnitStore_xmlBlaster_10_0_0_239_3412Hello and history_inforMessaging_10_0_0_239_3412Hello
2. run "java HelloWorldSubscribe -session.name joe/2 -dispatch/callback/retries -1 -multiSubscribe false -dispatch/callback/pingInterval 2000 -interactiveUpdate true -historyNumUpdates 0 "
two more queue are created :
callback_nodexmlBlaster_10_0_0_239_3412clientjoe2 and
the first queue is used for callback queue , what's the purpose of the second queue, say subject_nodexmlBlaster_10_0_0_239_3412clientjoe ?
and what are the contents of the subject_nodexmlBlaster_10_0_0_239_3412clientjoe??
Question 2;
The real message is in msgUnitStore and history queue and callback queue are only references to real message.
the question is :
when a publisher publish a message, will the message be fist put into msgUnitStore,
and then callback queue , and then history queue?
I have see the doc in the requirements directory and still was puzzled by this procedure can you explain this to me?

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