Sets the state of the specified event object to signaled. Uses EAX, ECX, EDX, and Flags.
The event object is set to a signaled state. If it is a manual reset event, it remains in the signaled state until it is explicitly reset and all threads currently blocked on this event are unblocked. If it is an auto reset event, one waiting thread is unblocked.
This service can only be called when the current VM is the system VM.