The Windows NT subkey stores configuration data for components of Windows 2000. The subkeys of the Windows NT subkey represent versions of the operating system, such as CurrentVersion, which refers to the version currently running on the computer. Each version subkey contains subkeys representing components that run on that version of the system.
The Windows NT subkey in HKEY_CURRENT_USER stores entries that apply only to the current user of the computer. There is also a SOFTWARE\Microsoft\Windows NT subkey in HKEY_LOCAL_MACHINE that stores entries that apply to all users of the computer.