An interactive playing/trading card system is described herein. This system includes a plurality of encoded cards, a controller, a card reader, memory and an output device. Information relating to the nature of the card is provided on each card to allow its identification by the card reader. Once this...http://www.google.com.hk/patents/US20020040929?utm_source=gb-gplus-share專利 US20020040929 - Interactive playing/trading card system
