Simple procedure:
Start EPE, end it either by the X symbol or File -> Exit (Ctrl+X).
Then open the Windows Task Manager
Under Applications, it shows "Running", same in Processes. Weird part, when press "End Task" under Applications it terminates, but under Processes it's still running, so have to press "End process" also. While running, EPE uses 0% CPU but 400MB Memory, when I end the program, the CPU goes up to 49%, Memory consumption stays the same.

Regarding your M-Column suggestion, I agree with it.

Edit: Sorry, under Applications its not listed anymore after closing EPE, that was FF website which was open and showed that topic. Beside, when I do nothing, just end EPE, then wait 2 minutes and then EPE is also gone from the Windows Task Manager