This small program runs in the background and checks permanant if a headset is connected to the PocketPC. When the headset is removed accidentally or intenional from the PocketPC, the volume will be set to a default value. This should prevent, that you forget to change the volume or to stop the music playing and so your music won’t “annoy” other people around you.
Source
This article is over 2 years old — the linked page may have changed, moved, or been taken over since then.