While it is increasingly easy to send data to geosynchronous orbit, getting the data the last few feet to where it is needed remains cumbersome at best. By perturbing the average voltage of a body by a tiny amount, it is possible to send data through a person, creating a Personal Area Network. This lets familiar gestures be associated with logical meaning, such as exchanging business cards through a handshake, authenticating an identity by touching a doorknob, or downloading messages by picking up a telephone.