Chatting in Schools and Universtities where Messenger is Blocked

Just before a couple of months we got Net connection for our lab. We could use the Net to surf the web, chat and visit Facebook. But soon the Teacher found out this and warned us not to use the Net. Believe or not, I have never used the Lab's Net connection to check my mail or to use Facebook (that's so nice about me )because the Lab computers were connected to each other and if I Sign In to my account the cookies would be saved and anyone could access my Inbox on the network. Also some computers didn't have Messenger installed. So how to use Messenger when the Administrators have uninstalled them? Here is a list of alternate ways to use them...




1). MSN Web Messenger
2). Messenger FX
3). Yahoo Messenger
4). Meebo (All in One Messenger)
5). ILoveIM (All in One Messenger)