Stage 6: Starting execution of the initial thread
At this point, the process environment has been determined, resources for its threads to use have been allocated, the process has a thread, and the Windows subsystem knows about the new process. Unless the caller specified the CREATE_SUSPENDED flag, the initial thread is now resumed so that it can start running and perform the remainder of the process-initialization work that occurs in the context of the new process (stage 7).
Stage 7: Performing process initialization in the context of the new process
The new thread begins life running the kernel-mode thread startup routine KiStartUserThread. KiStartUserThread lowers the thread’s IRQL level from deferred procedure call (DPC) level to APC level ...
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