The registry has thousands of settings; in fact , it often has tens of thousands. Three are organized into five main Registry sections, called Registry hives.
1. HKEY_CLASSES_ROOT
This hive contains information about file types, file extensions , and similar information. It instructs how to handle every different file type, and it controls basic user interface options, such as double clicking and context menus.
2. HKEY_USERS
This hive contains information about every user profile on the system.
3. HKEY_CURRENT_USER
This contains configuration information about the system setup of the user currently logged into. It controls the current user's desktop, as well as specific appearance and behavior for the current user. This hive also manages personal preferences, security rights, network connections, and connections to devices such as printers. This hive also includes Security Identifiers (SID), which uniquely identify user of the pc and contain information about each user's rights, settings, and preferences.
4. HKEY_LOCAL_MACHINE
This hive contains information about the computer itself, as well as the operating system. It includes specific details about all hardware , including the keyboard, printer ports and storage devices. In addition, it has information about security, installed software, system start-up, drivers, services, and the machine specific configuration.
5. HKEY_CURRENT_CONFIG
This hive contains information about the current hardware configuration of the system, in the same way the HKEY_CURRENT_USER hive contains information about the current user of the system.
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