The present invention provides a highly scalable architecture for a three-dimensional graphical, multi-user, interactive virtual world system. In a preferred embodiment a plurality of users interact in the three-dimensional, computer-generated graphical space where each user executes a client process...http://www.google.com.hk/patents/US8161385?utm_source=gb-gplus-share專利 US8161385 - System and method for enabling users to interact in a virtual space
