Instructions
Click anywhere on the display in the upperleft corner to select an
endpoint on the screen. Click the "Left" or "Right" buttons to have the
point on the screen move in the corresponding direction, and press "Stop"
to stop the movement. The "Highlight Main Paths" button toggles on and
off whether the paths close to the classical path will be highlighted in
black. Similarly, the "Show Path Vectors" button toggles on and off whether
the individual path vectors will be displayed or just the final vector
for the process.