This is a program designed for small Du/Tri-athlon sporting events (but probably more for tri-) where running and biking (and swimming?) can’t be done in the same place, so this program helps with that, and usually for swimming, the pool is not at the same place…
I did this when some guy approached me with such a problem he had when organizing these events, and the solution he was using was rather… poor (though he had no choice at the time). He was using some Excel document which looked like it was made by a mad man. You’d paste in the times and press the start button. Then Excel would freeze completely and eat up 100% CPU for no reason like wtf.
In essence how this works is, when athletes go through one section (i.e. running), the times are recorded in some time-logging program, like a spreadsheet maybe, athletes relocate to where they’ll be doing the next section (i.e. biking or swimming), recorded times are loaded into the program and the program counts down time difference and beeps when it reaches zero for each athlete.