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