I have a similar story but with a lot less actual hacking. Our school was monitoring lab computers using iTalk (?), which besides remote desktop also allowed th

I have a similar story but with a lot less actual hacking. Our school was monitoring lab computers using iTalk (?), which besides remote desktop also allowed things like sending messages and blanking the screen. After my Grand Hacking Crime of teaching all of my friends how to use proxy servers and supplying them with a text file containing several hundred that allowed them to bypass the website filter, I was constantly being watched, which annoyed the hell out of me. So I started digging around when the teacher wasn't looking and discovered that, while only the server part of the monitoring system was "installed", the files for the client part were still included. Without having the admin creds, all I could do is send messages, but that was enough. After testing it on a friend's computer as a joke, I sent the master PC a single message containing several hundred lines of Shakespeare's plays. The message appeared in an always-on-top msgbox and could only be dismissed by the OK button, which was by my estimate several meters below the bottom edge of the monitor.