Boss Radar is an app that alerts you when your boss shows up so you can always be prepared. This program constantly scans for bluetooth signals. When your boss is getting close, it would then warn you with a signal.
In addition to the alarm, the app can also quickly and automatically change your wallpaper, stop your music, switch your browser to something work-related, open up documents.
Boss Radar can be useful even outside of work. Use it with your wife, your husband, your room-mate, your kids etc.