WCF examples

Question

I got couple of scenarios of WCF from this site and that are below now I want exmples for tha like chat application,Dashboard application as mentioned below.

Can you please give couple of examples for that..

A few sample scenarios for WCF:

• A secure service to process business transactions. 
  
  
• A service that supplies current data to others, such as a traffic report or other monitoring service.
  
  
• A chat service that allows two people to communicate or exchange data in real time.
  
  
• A dashboard application that polls one or more services for data and presents it in a logical presentation. 
  
  
• Exposing a workflow implemented using Windows Workflow Foundation as a WCF service.
  
  
• A Silverlight application to poll a service for the latest data feeds.