Registry Root Keys

The Registry is organized into a hierarchy of keys, subkeys, and value entries. The root keys are at the top of the hierarchy and form the primary branches, or subtrees, of Registry information. There are two physical root keys, HKEY_LOCAL_MACHINE and HKEY_USER. These physical root keys are associated with actual files stored on the disk and are divided into additional logical groupings of Registry information. As shown in Table 14-1, the logical groupings are simply subsets of information gathered from HKEY_LOCAL_MACHINE and HKEY_USER.

Table 14-1. Registry Subtrees



Physical Subtree



Stores all the settings that pertain to the hardware currently installed on the machine.


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