In this manner, the host command is acted upon and completion is signaled back to {HEAD ~ the host processor} prior to expiration of {TAIL ~ a host protocol time} out 
In this manner , the host command is acted upon and completion is signaled back to { HEAD ~ the host processor } prior to expiration of { TAIL ~ a host protocol time } out
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH