title: Attach to 'screen' session with creating a new screen window
body: <p>I have a screen session running with several windows.  I want to attach to it, create a new screen window within it and start a shell in that new window.</p>
  
  <p><strong>Question:  How can I do this from the command line outside the screen session?</strong></p>
  
  <p>I already tried a lot, e. g. <code>screen -x</code> (but it attaches to one of the existing screen windows; it does not create a new one nor does it start a new shell).  Any hints are welcome.</p>
  
  <p>Environment is Linux (Ubuntu 12.04).</p>