A method and apparatus for receiving a user identifier and for instantiating a particular place object from one of a plurality of different place classes in response to the user identifier. The apparatus displays, on a display device, data stored in the particular place object to provide on the display...http://www.google.com.hk/patents/US5634057?utm_source=gb-gplus-share專利 US5634057 - Place object display system having place objects selected in response to a user identifier
