Not very hard to get through the filters. At school we've figured out how to get through filters, to get on any website you want (except porn). I presume your running Internet explorer, and you have your own accounts on the Pc's so you type in your username and password and it loads up? If thats true then load up your username and password, go to My computer, C: program files, internet explorer and then the .exe file right click and go to run as. the "run as other user" Enter someone elses username and password, and itll log on to a seperate internet connection. You can now go on games and whatever, but if you close the screen you have to redo the process.
You cant have your cake and eat it... What the hells the point in having it then!!!