A system and method are useful for conducting an exhibition at which visitors visit a plurality of booths or stations. A smart tag issued each visitor includes at least an electronic memory from which information from the memory may be provided and/or information may be received and stored in the memory....http://www.google.fr/patents/US6657543?utm_source=gb-gplus-shareBrevet US6657543 - Tracking method and system, as for an exhibition
