Ok if your school/office has a network and is running windows NT, 2000 or xp, right click the start button and click explore. Look for the users of the pc on the left hand side, usually urs is selected. Go to all users, into start menu, programs, and administrative tools. open computer managment on the right hand side and click action. Go to all tasks and then send console message... Now is the part where you need 2 know ur computer names. At my school they are conviently written on the pc :P and if say i was in room 201 my computer name would be 201-XX, with xx bing the computer number. So that helps me. Now comes the fun. add all the pc's in your room and make up a dumb error message. mine was "there is a virus found on the network and ur password has been reset to 'password'." within seconds of clicking send, the class was shouting and screaming and logging off to see if it had changed! Absolutly excellent!