A PASSERBY at the PC Expo in New York City last week ponders at 'Monitor Man', a computer mannequin set up as part of Mitsubishi Corporation's hi-tech display. The PC Expo, held at New York's Jacob Javits Convention Centre, attracted more than 800 companies, making it the largest PC trade show on the East Coast of the United States. Exhibitors diplayed the latest in personal computing technologies, most noteably demonstrating such features as video-conferencing, on-line information services, multimedia systems for the home and business, and new portable computers, including the latest in wireless systems. As well as the latest hardware gadgets, the PC Expo also featured a large number of software houses demonstrating the latest applications software for personal computers. The PC Expo is seen as the East Coast's answer to the massive Comdex Show held in Las Vegas.