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