An interactive display system includes {HEAD ~ a display} such as {TAIL ~ a cathode ray tube} , for example, and a display controller 
An interactive display system includes { HEAD ~ a display } such as { TAIL ~ a cathode ray tube } , for example , and a display controller
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH