title: why ?gwt.codesvr=127.0.0.1:9997 is appended to url?
body: <p>I am using ExtGWT. in development mode we append <strong>?gwt.codesvr=127.0.0.1:9997</strong> to url. please help what it means and why we should append?</p>
  
  <p>Thanks!</p>