How to implement single instance per machine application?

Question

I have to restrict my .net 4 WPF application so that it can be run only once per machine. Note that I said per machine, not per session.
I implemented single instance ap

Answer 1

I did something similar once.

When staring up the application list, I checked all running processes for a process with identical name, and if it existed I would not allow to start the program.

This is not bulletproof of course, since if another application have the exact same process name, your application will never start, but if you use a non-generic name it will probably be more than good enough.