title: Monitoring storage space on windows mobile
body: <p>In a native(c++) windows mobile app.  There are ways to be notified of low memory, <code>WM_HIBERNATE</code>, and low power, <code>RequestPowerNotifications()</code>.  </p>
  
  <p>Is there any way to be notified when storage space is running low?  Or must an app just poll regularly with <code>GetDiskFreeSpaceEx()</code>?</p>