So there are 4 IOCP worker threads, which can all pass messages to the main CDialog class, so is it possible that two message handlers execute simultaneously?
No. You dialog messages are only handled in one thread, the thread that created the dialog. Windows doesn't magically create threads in the background. It starts one thread and instantiates your application in it. Any other threads are created by you and you (or your code) is fully aware of them and what they are doing.
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