title: full-duplex TCP/IP stream socket connection vs PollingDuplexHttpBinding vs WSDualHttpBinding
body: <p>full-duplex TCP/IP stream socket connection vs <code>PollingDuplexHttpBinding</code> vs <code>WSDualHttpBinding</code> 
  I want to know - </p>
  
  <ul>
  <li>What is same</li>
  <li>What is different</li>
  <li>Some comparing tables</li>
  <li>Some articles</li>
  <li>Where what can\cannot be used 
  etc. </li>
  </ul>