http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/computer_system_hardware_classes.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/querying_with_wql.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wmisdk/wmi/querying_with_wql.asp
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