Even though you may have a high speed broadband .. there will a firewall blocking certain sites and gaming application.
You wil be using a proxy to connect to the internet an there won't be any free ports available for any online multiplayer game to run.
Also you might get into trouble with the Network Admins over breach of policies like installing unauthorized softwares etc.
My advice would be to wait till you get home to start gaming.
At the very least if you do wanna kill time then get Angry Birds for PC ..