title: How to take screenshot of current window using PHP?
body: <p>I am trying to prepare desktop application using PHP Nightrain.
  I want to take screen shot of open window after every 10 seconds. I tried using html2canvas but it is taking screen shot of application open page.
  If I will open Microsoft word and work inside it that time i want screen shot of it using PHP.
  Is it possible using PHP?
  And one more thing I want to make desktop application using PHP which is OS compatible.</p>