Of course it does if you have a good cracked client, I've had my version of the cracked client since long before the actual release and it works fine.

Also there are server that use plugins to tell if the client is modded and auto-kicks anyone who joins it. So just watch out for those.

No special requirements needed for the cracked version I have, but I don't hand it out to just anyone.

Good to see the minecraft section of this forum is still being used, slightly.