I haven't worked with goefences, but I'm guessing you can tell the OS you're interested in receiving particular geofence events such as when a user enters one.

I haven't worked with goefences, but I'm guessing you can tell the OS you're interested in receiving particular geofence events such as when a user enters one. So the OS will relaunch apps which subscribed to those events so they can act on it. Someone who has actually worked with geofences, please correct me if I'm wrong.