a control unit that carries out connection and disconnection to and from each of the host computers as sources of print requests according to {HEAD ~ the host information} registered in {TAIL ~ said registration unit} 
registered in
a control unit that carries out connection and disconnection to and from each of the host computers as sources of print requests according to { HEAD ~ the host information } registered in { TAIL ~ said registration unit }
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 HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL