what are the use of key generator?

A key generator basically gives you the CD keys for games and software, in case you lost yours. I would not recommend using that software or game online after getting a key generated, as the keys generated are from people who have been banned online for cheating or hacking, or in general misbehaving, lol. As for the legality, I am not a lawyer. Where to get them? Google it by the program name and the keywords "key generator". you should find it pretty quickly, and if you look, the site will give you upload and installation instructions. Good luck!

They generate activation keys for programs, but it's illegal.

to find your install numbers if you loose them, however, I guess from a question I answered a few minutes ago, people think it's used for illegal issues, call me stupid, I sure felt that way after answering the dudes question, I didn't think it was for a bad purpose, but everyone else who answered did!

Imformation here.. Check it out.

http://en.wikipedia.org/wiki/Keygen

i think its pretty self explanatory what it does (for gods sake, not that key that you open doors with)

Hey! no... There not legal.... but that doesent stop a determend googler..... =)