(adsbygoogle = window.adsbygoogle || []).push({}); just wanted to know i cant think how they are

thanks matt

and sometimes once they are used once, you cant use them again.

They work because the programmer cracked the algorithm required in order to create each individual key. Different programmers use different algorithms to create keys. Once the algorithm is cracked by the programmer it is as simple is putting that into the program. Not all are the same though so that is why each program needs a separate keygen.

They code so that you can get programs for free. (Simple)