In operation, {HEAD ~ a user} at {TAIL ~ either console} 120 or 130 may provide commands to either or both of control units 150 and 165 via the proxy server 105 
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In operation , { HEAD ~ a user } at { TAIL ~ either console } 120 or 130 may provide commands to either or both of control units 150 and 165 via the proxy server 105
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH