I've been there and seen Otto come and go. Make a sound when you come into the room by clicking on the musical notes and beeping a car horn, or something, as it's not being very productive to sit and stare at a blank screen.
Sorry Sue - computer got hijacked by a pair of fifteen-year-old infidels! My only mistake was to remain logged on while they enjoyed "their" 3 hours of internet chat with some "cool dood" living in London.
Hope everyone had a good time in the end - I certainly did for the short time I was "allowed" back on!