here it is in a nutshell
for things like god mode
auto block
cant die
infinate ammo
spawn a rocket launcher
infinate health
any animation
any sounds
etc etc
even in nw
u can do it no problem for hosted games or if ur running the server
if u are just a client logging onto a server it is more difficult
but ive done it before as many of my reg have witnessed
so yes can u explain what kind of thing you are wanting