The Simulation Engine accepts simulation inputs and calculates {TAIL ~ various outputs} and notifies {HEAD ~ the system} of the status of the simulation at a given time in order to obtain appropriate feedback 
The Simulation Engine accepts simulation inputs and calculates { TAIL ~ various outputs } and notifies { HEAD ~ the system } of the status of the simulation at a given time in order to obtain appropriate feedback
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH