hkey

HKEY is a term used in the context of the Windows operating system and its registry database. The term stands for "Handle to a Key," and it is a reference to a specific location within the registry hierarchy. The Windows Registry is a hierarchical database that stores low-level settings for the operating system and for applications that opt to use the registry. These settings include user preferences, application data, and system configuration information.

Each HKEY represents a root key, which is the top-level node in the registry hierarchy. There are several predefined root keys, each serving a specific purpose:

- HKEY_CLASSES_ROOT (HKCR): Stores information about registered applications, including file associations and COM objects.

- HKEY_CURRENT_USER (HKCU): Contains settings specific to the currently logged-in user.

- HKEY_LOCAL_MACHINE (HKLM): Stores configuration data for the local computer, including hardware and software settings.

- HKEY_USERS (HKU): Contains default user settings and settings for all users who have logged into the computer.

- HKEY_CURRENT_CONFIG (HKCC): Stores information about the current hardware profile.

HKEYs are accessed and manipulated using the Windows Registry Editor, a built-in tool that allows users and administrators to view, add, modify, and delete registry keys and values. It is important to exercise caution when editing the registry, as incorrect changes can lead to system instability or even render the system unbootable. Therefore, it is recommended to back up the registry before making any changes.