A user initiates an unprompted, context-sensitive request for supplemental content related to a television broadcast being displayed by an interactive television system. The information request includes an identification of the interactive television system and contextual information pertaining to the...http://www.google.com.tw/patents/US20020083464?utm_source=gb-gplus-share專利 US20020083464 - System and method for unprompted, context-sensitive querying during a televison broadcast
System and method for unprompted, context-sensitive querying during a ...