title: Detect when user takes a screen shot in windows with print screen?
body: <p>So, I need to, in my application, detect when the user takes a screenshot in Windows by using the print screen keyboard button. I noticed that Picasa does this and notifies the user, this would be very useful in my chat software. It needs to be able to detect it even when the window doesnt have focus. Anyone know how I would do this?</p>
  
  <p>Thanks in advance!</p>