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