title: Change focus to another window, where name is undefined
body: <p>I'm using <a href="https://github.com/admc/wd" rel="nofollow">WD.js</a> webdriver client for node.js to test my app.</p>
  
  <p>In my app after a button click a new browser window opens.
  Obviously by the nature of selenium the old window stays active. </p>
  
  <p>I've tried to use the <code>window()</code> method from wd.js to switch to the new window but <a href="https://code.google.com/p/selenium/wiki/JsonWireProtocol#POST_/session/%3asessionId/window" rel="nofollow">it needs a window name as a parameter</a> which isn't set.</p>
  
  <p>Is there any way to switch between windows without knowing their name?</p>