I am trying to play a random music selection in the background of a presentation in impress. Impress can play music of course, but not (I think) randomise the selection. So I call an external program (VLC) to start the music. This works.
Now I need to stop the music at a certain point in the presentation (end of slide 0). I have set a listener which gains control at the end of slide 0. How do I kill my external program to stop the music?