Thereisanexplosionoftechnologiestocommunicatewithmobileandoccasionally-connecteddevicesandsensors.Wirelessnetworking(WiFi),cellulartelephone(GSM),packetradio,radiofrequencyidentifiers(RFID),smartpersonalobjecttechnology(SPOT),globalpositioningsystems(GPS),andsensornetworksarealreadywithus.M