❑ HKEY_CLASSES_ROOT(HKCR)
❍ File extension ↔ Software connection settings.
❍ Mouse right-click menu settings.
❍ About handling files settings.
❑ HKEY_CURRENT_USER(HKCU) : Current logged user setting
❍ Control Panel settings.
❍ Network connection settings.
❍ System settings, such as application settings.
❑ HKEY_USERS(HKU) : Individual users settings
❍ HKCU and HKU are similar.
❍ Individual system settings.
❍ Default system settings required for creating a user profile(.DEFAULT).
❑ HKEY_LOCAL_MACHINE(HKLM) : All users common settings
❍ Hardware settings.
❍ Software settings.
❑ HKEY_CURRENT_CONFIG(HKCC)
❍ Hardware profile settings.
❍ The data collected at run time.