Disclosed are systems and methods employing a portable card to configure a commercial system. An exemplary system acts to read from the card at a first location in the store, to process a signal corresponding to a first promotion set stored on the card. The exemplary system also acts to read from the...http://www.google.de/patents/US6354492?utm_source=gb-gplus-sharePatent US6354492 - System and method employing a portable card to configure a store for product promotion
