Removes the specified key and all of its subkeys from the OpenVMS
    Registry database.

                              CAUTION

       Deleting a key results in symbolic links not being followed.
       This is because the system deletes the key you specify,
       even if it has symbolic links.

                               NOTE

       The OpenVMS Registry database predefined keys are reserved
       keys and cannot be deleted. These keys are HKEY_USER,
       HKEY_LOCAL_MACHINE, and HKEY_CLASSES_ROOT.

    This command requires the SYSPRV privilege or the REG$UPDATE
    rights identifier.

    Format:

      DELETE TREE  key-path key-name

    key-path

    Specifies the key path.

    key-name

    Specifies the name of the top level key of the tree to be deleted.