Hitman 2: Silent Assassin

If you have the right cheats in the first place (check this VERY website lol) then all you have to do is input them while playing the game, eg.while killing, shooting etc

Also, if you use a cheat then input another while the note says "xxxxxxxx is activated" then it might not do it...
Just wait till the note goes away ;)

I tried to put in unlimited ammunition and god mode and all weapons but neither of them worked. i tried to wait and nothing til, nailgun mode worked and so did bomb mode. but the other three dont work and i took the cheats of of this site. so umm ya im kinda stuck on not knowing why its not going in.