title: ImageGrab.grab() the second screen while running code on the first screen
body: <p>As the question says. Can I screenshot the second screen when my script is running on the first screen?
  I mean I have the code running on my first screen and I want to capture the second screen only. How do I do it? Of course all done with <code>ImageGrab.grab()</code> from <code>PIL</code> module.</p>