WinNT has a "feature" that allows anonymous (no username, no password) access to the registry. This is different than the "guest" account. This feature first appeared in WinNT 4.0 SP3. Hive: HKEY_LOCAL_MACHINE Key: SYSTEM\CurrentControlSet\Services\LanManServer\Parameters Name: NullSessionPipes Data Type: REG_MULTI_SZ Value: Add or remove names from the list as required by the configuration
