Hkey_Classes_Root

This key displays information about OLE and associated mappings to support drag-and-drop operations.

Hkey_Current_User

This points to a branch of Hkey_Users for the currently logged on user.

Hkey_Local_Machine

This contains computer specific information including installed hardware and software. This is the one I tend to spend the most time in.

Hkey_Users

This contains information about users that have logged on to the computer.

Hkey_Current_Config

This key points to a branch of Hkey_Local_Machine Config and has information such as display fonts and printers.

Hkey_Dyn_Data

This key points to a branch of Hkey_Local_Machine that has information about Plug and Play devices.

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