Proof of concept based on sample described by Tomek Janczuk in his blog posts: http://tomasz.janczuk.org/2009/07/pubsub-sample-using-http-polling-duplex.html http://tomasz.janczuk.org/2009/09/scale-out-of-silverlight-http-polling.html
... the idea was to check posibility of notifying client whenever there are new data available on the server.