your question totally depends on where the code is executed. Client side processes like Javascript runs on the client and can go out and poll information without posting back the entire page. Server side code like ASP.NET requires the page to be posted back so the server can poll the information and process it. if you want the page to auto-refresh you can add line to the header to do this, but it posts back the entire page. If you're looking for some sort of scrolling score update or stock ticker type of deal that updates without a postback it must be a client side process.
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