This allows the image forming apparatuses to mutually inform {HEAD ~ the processing statuses} prior to {TAIL ~ assignment} of the print data 
This allows the image forming apparatuses to mutually inform { HEAD ~ the processing statuses } prior to { TAIL ~ assignment } of the print data
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH