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I'm no Windows programming guru, but I believe something like that would require at least driver, level access (ring2-1), or maybe even kernel level access (ring0). .Net runs in Ring3 afaik, with no way to [elegantly] get down to lower levels.
I've actually lost the program - i did end up creating it - but i am now an OSCP certified professional and doing computer security research at OU right now. Why the hell did i post this on minecraft forums..?