The system 23, wherein the user monitor module comprises a radio frequency identification device, wherein the radio frequency identification device is capable of drawing {TAIL ~ power} from {HEAD ~ the radio frequency waves} to transmit a signal carrying an identification of the radio frequency identification device 
The system 23 , wherein the user monitor module comprises a radio frequency identification device , wherein the radio frequency identification device is capable of drawing { TAIL ~ power } from { HEAD ~ the radio frequency waves } to transmit a signal carrying an identification of the radio frequency identification device
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