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Originally Posted by abitofboth
btw. i've been told that i can have 4 sessions going by simply, in XP, swithcing to another user and run 2 more from that account!!!! if thats telling something about what strategy it may use!!
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Switching between users is a nice (but timewasting) trick to fool it. None of the above ways (process/class check, mutex or semaphores) can prevent an application from running in another user session (like switching with WinKey+L).
As retroer said there are plenty utilities out, or you can handle to make it by your own, to kill or change the mutexes. That will also work for all future versions of the program.