The third page in the window is the Arbitrary Path Page allows you to enter a series of Station Names and highlight the route or path through those stations.
To do this, simply enter the station names in the text box separated by commas. Pressing the "Display" button will highlight the path you've specified. For example, if you entered the path "A1,A2,A3,A4", the program would draw path between those stations.
The specified path goes straight from station to station, even if there are no shots between those stations. If one of the Station Names is not found, the program will stop processing and only display the path up to that point.