An image forming apparatus capable of communicating with {TAIL ~ a plurality} of {HEAD ~ host computers}, comprising: 
An image forming apparatus capable of communicating with { TAIL ~ a plurality } of { HEAD ~ host computers } , comprising :
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH