20.wifi
This technology uses a battery-powered tag with a wireless infrastructure to locate objects. It is based on a patent-pending Wi-Fi positioning technique, which is capable of detecting any standard 802.1 b/g mobile unit, for example laptops, PDAs, barcode scanners, RFID readers and other assets or people. Also, the visibility tools provided by netlink rfid TM allows the developers to create location-enabled applications.

It locates standard Wi-Fi clients such as laptops, PDAs, barcode scanners and other wireless devices without the need for any hardware or software modifications. This eliminates a major management challenge and enables simple implementation in public environments.

Wi-Fi continues to be the pre-eminent technology for building general-purpose wireless networks. A Wi-Fi network in ad hoc (or peer) mode allows two or more devices to communicate with each other directly instead of through a central wireless router or access point.

­As long as they all have wireless adapters, several devices can use one router to connect to the Internet. This connection is convenient, virtually invisible and fairly reliable; however, if the router fails or if too many people try to use high-bandwidth applications at the same time, users can experience interference or lose their connections.