title: Allow different divs to be moved by different IP Sessions
body: <p>I am a beginner in coding, forgive me for the question,</p>
  
  <p>I have this fiddle <strong><a href="http://jsfiddle.net/G48vx/4/" rel="nofollow">http://jsfiddle.net/G48vx/4/</a></strong></p>
  
  <p>and I want the two boxes to be moved by two different persons who enter the website. Person A can only move the blue box, and Person B can only move the red box. How can I achieve that? I have heard about <code>websockets</code>, but I'm not sure which technologies I need for this. Does anyone have any demo + codes of similar multi sessions? THank you.</p>