@REGDELKEY[HKEY...\key] : Deletes the specified key and all of its subkeys. Returns 1 if the key was deleted, 0 otherwise. The expression must be enclosed in double quotes if it contains any separator characters (space, comma, or tab).
If you are running a 64-bit version of Windows, you can access the 64-bit registry instead of the 32-bit registry by appending "_64" to the HKEY name.
If the key name begins with \\machinename, @REGDELKEY opens the registry on a remote machine. The remote registry service must be running on the remote machine, and you must have access and permissions. The HKEY parameter can be one of the following keys:
HKEY_CLASSES_ROOT (or HKCR)
HKEY_CURRENT_CONFIG (or HKCC)
HKEY_CURRENT_USER (or HKCU)
HKEY_LOCAL_MACHINE (or HKLM)
HKEY_PERFORMANCE_DATA (or HKPD)
HKEY_USERS (or HKU)
Note: use EXTREME caution with this function. It has the potential for causing irreparable damage to your registry and can even prevent Windows from booting!
See @REGCREATE for information on the format of the key name.