In one aspect, a network system includes a user interface which allows a user to interact with the network system. An agent server is coupled to the user interface. The agent server manages the operation of the network system. Furthermore, the agent server in conjunction with the user interface is operable...http://www.google.com.hk/patents/US7949752?utm_source=gb-gplus-share專利 US7949752 - Network system extensible by users
