title: How to flash entire screen in C#?
body: <p>It takes some time for my program to finish computation, so I would like to run it, read some web pages meanwhile, and when the screen flashes (notification of finished computation), I would get back to my program.</p>
  
  <p>The only missing part is -- <strong>how to flash entire screen in C#?</strong> I use WPF if this matters.</p>
  
  <p><strong>Please note</strong> -- my program is not visible, the other program (web browser for example) takes entire screen (that is the point of the problem, because otherwise, I wouldn't need any notification at all).</p>
  
  <p><em>Flash = blink.</em></p>