title: monitor mouse status on Mac OSX
body: <p>I wanted to monitor mouse status(connect/disconnect) in system wide on OS X. I checked the Apple developer library, but cannot find any clues.  </p>
  
  <p>My goal is to monitor both USB and Bluetooth mouse. Any API that I could use?</p>
  
  <p>Thank you very much.</p>
  
  <p>--N</p>