With NT4-style registry-based policy changes, a large number of settings are not
automatically reversed as the user logs off. The settings that were in the
NTConfig.POL file were applied to the client machine registry and apply to the
hive key HKEY_LOCAL_MACHINE are permanent until explicitly reversed. This is known
as tattooing. It can have serious consequences downstream, and the administrator must
be extremely careful not to lock out the ability to manage the machine at a later date.