In the proposed system, a touchpad is attached to a backside a mobile device. The combination of frontside and backside input allows users to conduct several manipulations (zooming, scrolling etc.) easily and efficiently.

CityVoyager is a shop recommendation system for city dwellers, designed to run on mobile devices. The system automatically estimates users’ preferences and needs from the history of their past location data acquired using GPS, and presents a tailored list of recommended shops.