This synchronization mechanism insures that the desired output which is presented to the foreground program is in {HEAD ~ fact} based on {TAIL ~ real time data} 
based on
This synchronization mechanism insures that the desired output which is presented to the foreground program is in { HEAD ~ fact } based on { TAIL ~ real time data }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL