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