If {HEAD ~ the pixel shader debugger link} is selected by the user, then a pixel shader debugger window is opened to display information regarding {TAIL ~ the pixel shader} used for the selected pixel 
If { HEAD ~ the pixel shader debugger link } is selected by the user , then a pixel shader debugger window is opened to display information regarding { TAIL ~ the pixel shader } used for the selected pixel
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH