title: Toggle between "Extend these displays" and "Show desktop only on 1"
body: <p>I'm looking for a way to programmatically alter the video properties in Windows 7.  I'd like to toggle the Multiple display state (as seen in Control Panel > Appearances and Personalization > Display > Screen Resolution) between "Extend these displays" and "Show desktop only on 1".</p>
  
  <p>This is the sort of thing that I think is probably doable just by knowing the right Windows executable/dll to invoke with the right parameters and bundling that into a script or shortcut, but if so that information eludes me.</p>
  
  <p>Actual code solutions are fine, of course, but I'd like the change to be permanent and not just disable the other monitor(s) for the duration of the application.</p>