title: WCF Notification and Callback with clients
body: <p><img src="https://i.stack.imgur.com/SRL3j.png" alt=""></p>
  
  <p>As shown above am trying to achieve the same. In detail :</p>
  
  <ol>
  <li><p>I have a WCF service on Public IP and WCF clients with internet access</p>
  
  <p><strong>Central Service</strong> : It supposed to check any price change at central node and notify the same to the WCF clients.</p>
  
  <p><strong>Client service</strong> : On notification from central service the client will perform Pulling data from the server and acknowledegs the same back.</p></li>
  <li><p><em>Firstly I wanted my central service to know about clients and send notifications to the clients, My question is how can I see them(WCF clients) ? even as a subscriber list what data of the client should I have to notify the WCF clients.</em></p></li>
  <li><p><em>Secondly the client needs to update the server oncompletion of a particular task.</em></p></li>
  </ol>
  
  <p>I am looking for anwsers moreover on suggestion of pattern or any ideas on how to achieve the same. Any links will highly appreciated. </p>
  
  <p>Thanks</p>