title: Show dialog/frame fullscreen on a second screen sing QT/c++
body: <p>I have an application with a secondary view that should be shown fullscreen on the other monitor (the one the main app is not on).</p>
  
  <p>Displaying the frame works quite well with <code>frame.showFullScreen();</code></p>
  
  <p>But, how can I tell it which screen it should be on? 
  Is there a way to detect if a second screen is avauilable, as well?</p>