The security network 6 wherein one of the first and second control functions is the master controller and {HEAD ~ the remaining control function} is {TAIL ~ a slave} to the master controller 
is
The security network 6 wherein one of the first and second control functions is the master controller and { HEAD ~ the remaining control function } is { TAIL ~ a slave } to the master controller
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH