quake 3 arena hack

hello people...i am a real new person and i want to know how to use hacks on quake 3 arena. i only hav a demo version. so wat a re the hacks?wat are their effects?and how to use them....if u also know any other things about quake 3 arena demo hacks plz recommend...

Ummm, i actully never heard of that game. Is it good? And is it like a war game or something?