What is the “Master Key” that is used to create the key-pair and PPID?

I talk a bit about the Master Key created when you create a personal card in my post at http://www.fearthecowboy.com/2007/02/what-is-master-key-that-is-used-to.html

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Garrett Serack | Program Manager |Federated Identity Team | Microsoft Corporationblog:http://blogs.msdn.com/garretts