title: How to implement Realtime push notification for my website?
body: <p>I have a website which has two parts. The first part is used by <code>X</code> people and the second by <code>Y</code> people. The <code>X</code> people asks for help and the <code>Y</code> people instantly receiving the <em>SOS</em> resonds with an <em>ETA</em> of their arrival. I am using <code>PHP-MySQL</code> implementing the database and logging all the interactions of X and Y people. I know I can use Ajax for this purpose. Then Again I am not a big fan of Polling through <code>setInterval</code> method. <br></p>
  
  <blockquote>
    <p>Which is the best approach to push messages and show notificaions from
    one page to another?</p>
  </blockquote>