http://blogs.technet.com/mmpc/archive/2009/06/05/radio-frequency-identification-devices-is-infection-a-reality-part-2-hardware.aspxAn RFID system is based around a reader and a tag. A tag stores information, whereas an RFID reader retrieves or modifies information stored on the tag. To transmit this information through the air, both devices use high frequency electric current oscillationsen-USCommunityServer 2.1 SP1 (Build: 61025.2)