Back in 2000, when I was in high school, I developed a trojan similar to netbus and sub7, but just to use it in the school comp labs. The objective was only to have fun. Telling my friends their login passwords, controling their pcs, (screen streaming, key logging, file management, mouse and kb control, some nice screen effects like making the screen move like ocean waves, launch programs, it was fun, lol). There were like 200 machines connected. The infection was simple (auto-installed in services/run) and later it was even network-automated (when I got the admin pass). Then, I handed the commanding program to some friends who used it a little bit too uch. We even had the net admins credentials, so we started to get some extra benefits (like internet outside the internet lab, etc). The admins realized what was happening, and started to use Norton ghost in every pc, first once a week (before it was once every 2 weeks), then, as the infections didnt stop and they started to get very paranoid, they run Norton ghost every single day. It all ended when they discovered a copy of the the source code I had given to a friend of mine. They confronted him, but luckly he took the blame (as he later told me, it was very dumb of him to have saved a copy in his own account. But he managed to convince them that it was just a learning project that went little bit too far. They reprimanded but nothing serious happened to him. So, he is still one of my closest friends,=)