Suppose you have a central Internet faced server and multiple backend servers not connected to the Internet. To insure that your Internet faced server is always up-to-date with the latest Microsoft Web Stack products and updates, you can use Web Platform
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Read the complete post at http://blogs.iis.net/kateroh/archive/2010/02/27/webpi-api-load-balance-to-set-up-backend-servers-with-latest-microsoft-web-stack.aspx