The new product, nTAG, can work as a networking tool, polling device, attendee tracker, and even a digital ticket for invitation-only events. Launched in April by nTAG Interactive (www.ntag.com), the badges "talk" with other other via infrared sensors and communicate over a wireless network with a central server. For the attendee, the badge is pre-loaded with information he or she wants to share with others. (The data is provided by the attendee via a Web site established by the meeting organizer.) When attendees approach one another, their badges' infrared sensors automatically exchange data and find areas of mutual interest, which are displayed on the badges' LCD screens — instant networking. After an event, attendees are e-mailed a report on everyone they met at the meeting. The system allows event hosts to send messages to attendees, poll the audience with multiple-choice questions, track attendance at sessions, and even see who's networking with whom.The nTAG badges are for rent, not for sale, with the minimum cost starting around $40 per badge.