Using PC Lap Counter with the DS300 is simple, if you let PC Lap Counter do all the work. Simply set your DS300 for a lap-delimited raced of 9999 laps. Use PC Lap Counter for everything else: start, pause, and stop the race. All you have to do is ensure that the DS300 interface between it and PC Lap Counter is running, and PC Lap Counter will control everything else. Basically, the DS300 is used just as a sensor for PC Lap Counter.