ah
but if you had an illegal copy of the game then someones elses cd-key would allow you to play online

the drawback is if you both log in at the same time one of you gets booted AND the key gets "flagged"

enough "flags" and the key gets banned and neither of you could play online

dont hand out your cd-keys

and people,
i have said this A THOUSAND TIMES

get a CD marker pen and write your CD key on your CD

B.