you do realise they may have vnc software installed to watch what your doing right? my college tech was a good friend and he told me a few of the tricks they use, things like having vnc installed and having someone watch randomly the screens of the computers, things like having a single boot disk with a single password set which is used for all the computers etc.
he even gave me hints about getting around the security (using a blank account and changing the ip address to static, but outside of the dynamic range of the computer giving out the ip addressses), booting up and removing the inet cable to get access to local admin without tipping them off and being able then to create another account to use online so they couldnt monitor you.
its great having a tech friend, even though i shoulda had his job :/ grumble.

anyway back on topic - watch your back.