When a print request is received from one of {HEAD ~ a plurality} of {TAIL ~ hosts}, host information indicative of the host is registered so that an order of print requests can be identified 
of
When a print request is received from one of { HEAD ~ a plurality } of { TAIL ~ hosts } , host information indicative of the host is registered so that an order of print requests can be identified
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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