The !regkcb extension displays a registry key control block.
Specifies the address of the key control block.
Windows XP and later
For information about the registry and its components, see Microsoft Windows Internals, by Mark Russinovich and David Solomon.
In Windows 2000, !regkcb displays a specific registry key control block.
In Windows XP and later versions of Windows, the !reg extension command should be used instead.
Every registry key has a control block that contains properties, such as its permissions.