title: Check for device change (add/remove) events
body: <p>I'd like to know if there's a way to trigger an event when a device is added or removed from the system. I want to be able to detect if say, a USB flash drive has been added, or a mouse, or whatever else. I tried searching around, but I can't find anything that say's how to do this.</p>
  
  <p>Any ideas?</p>