Multi-session PAT - why does multi-session PAT get this name?

Hello firewall experts
I have read configuration guide for ASA 9.1.1 and found the topic of per-session PAT and multi-session PAT.
The configuration explains well about the benefits of using per-session PAT but, it does not talk enough when we should use multi-session PAT and why.
Why did they give the name of multi-session PAT to this multi-session PAT?
What are the application protocols that would be benefitials to use multi-session PAT and why?  In the configuration guide, it speak to such protocols as SIP, H.323, and Skinny protocols as the candidates for multi-session PAT but, it does not mention why we should use it or what characteristics of these protocols make multi-session PAT more suitable for them.
Can someone help with it?
Thank you in advance.

Thanks Donald. This is good info to know.
So does this mean that a single ReportQuery object would NOT be thread-safe if it re-prepares itself for every call? By thread-safe, I mean that I do not want the state of the object to change for ANY call. I'm concerned that the following race condition could occur:
THREAD 1: Statement is prepared for an IN param list of size 3
-- TIME SLICE HAPPENS JUST BEFORE QUERY IS EXECUTED --
THREAD 2: Statement is prepared for an IN param list of size 5. Query is executed successfully.
-- TIME SLICE BACK TO THREAD 1 --
THREAD 1: Query is executed after it was reprepared for 5 IN params and fails because there were only 3 arguments provided for this thread.

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