http://blogs.msdn.com/cqwang/archive/2008/06/12/detailed-overview-of-silverlight-2-beta-2-web-service-features.aspxSrc: Silverlight Web Services Team &#160; Duplex Communication (Server Push) This has been the most requested feature from our customers since the release of Beta 1, and it enables some useful scenarios like building chat and monitoring apps. Duplex allowsen-USCommunityServer 2.1 SP1 (Build: 61025.2)http://blogs.msdn.com/cqwang/archive/2008/06/12/detailed-overview-of-silverlight-2-beta-2-web-service-features.aspx#8921857Wed, 03 Sep 2008 14:38:57 GMT91d46819-8472-40ad-a661-2c78acb4018c:8921857Silverlight 2 WCF Polling Duplex Support - Part 3: The Client &laquo; Peter McGrattan&#8217;s Weblog<p>PingBack from <a rel="nofollow" target="_new" href="http://petermcg.wordpress.com/2008/09/03/silverlight-polling-duplex-part-3-the-client/">http://petermcg.wordpress.com/2008/09/03/silverlight-polling-duplex-part-3-the-client/</a></p>