Push data to client without using CallBack in WCF

Question

Is it possible to push data to client in WCF service without using callback?

Scenario:

There are 2 client consuming service. Client 1 send message and then Client 2 get message send by Client 1.

Answer 1

There are several approaches to this problem

1. Use Publish-Subscribe Framework

2. Using Duplexing service in WCF

Also have a look at this article, Push Data to the Client using WCF CallBack Service http://www.dotnetcurry.com/ShowArticle.aspx?ID=721