What is the difference between the Product ID and the Key code?

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 The Key Code is what you must enter during the installation process. The Product ID is generated during the installation process to identify the version of Vista you are installing. The product ID is for Microsoft's Tech Support.
 
 If at any time you should need the Product ID or you can't find your Key Code, you can install a free program that will list these two items along with many other configurations of your system. The program is called: Belarc Advisor