title: Detect whenever click event is fired in fully transparent window
body: <p>I have a transparent controls and window where I can click through as it would not even exist. My question is: Is it possible to detect whenever click event is fired no matter where on the screen I click, while the wpf applicaton is running? 
  The reason why I need this is because I'm making an agent that will collect all information about actions made by user. Any suggestions, hacks, tricks will do.</p>