for displaying {TAIL ~ the child frame} at an appropriate displayed position using the data for {HEAD ~ display} 
for displaying { TAIL ~ the child frame } at an appropriate displayed position using the data for { HEAD ~ display }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD