A system and method for evaluating responses to broadcast programs, such as television programs, includes an instructional signal modulated onto a signal transmitted concurrently with the television program, or time-multiplexed with television signals. At each of a plurality of remote receiving stations,...http://www.google.de/patents/US5916024?utm_source=gb-gplus-sharePatent US5916024 - System and method of playing games and rewarding successful players
