The method 14 which includes {HEAD ~ the steps} of determining {TAIL ~ at least first and second points} on said screen, using said first point to determine the location of said first spiral path and using said second point to determine the location of said second spiral path 
The method 14 which includes { HEAD ~ the steps } of determining { TAIL ~ at least first and second points } on said screen , using said first point to determine the location of said first spiral path and using said second point to determine the location of said second spiral path
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH