This policy setting permits or prohibits the use of this snap-in. If you enable this policy setting, the snap-in is permitted ...

This policy setting permits or prohibits the use of this snap-in. 

If you enable this policy setting, the snap-in is permitted and can be added into the Microsoft Management Console or run from the command line as a standalone console. 

If you disable this policy setting, the snap-in is prohibited and cannot be added into the Microsoft Management Console or run from the command line as a standalone console. An error message is displayed stating that policy is prohibiting the use of this snap-in. 

If this policy setting is not configured, the setting of the "Restrict users to the explicitly permitted list of snap-ins" setting determines whether this snap-in is permitted or prohibited. 

--  If the policy setting "Restrict users to the explicitly permitted list of snap-ins" is enabled, users cannot use any snap-in except those explicitly permitted. To explicitly permit use of this snap-in, enable this policy setting. If this policy setting is not configured or disabled, this snap-in is prohibited. 

--  If the policy setting "Restrict users to the explicitly permitted list of snap-ins" is disabled or not configured, users can use any snap-in except those explicitly prohibited. To explicitly prohibit use of this snap-in, disable this policy setting. If this policy setting is not configured or enabled, the snap-in is permitted. 

When a snap-in is prohibited, it does not appear in the Add/Remove Snap-in window in MMC. Also, when a user opens a console file that includes a prohibited snap-in, the console file opens, but the prohibited snap-in does not appear.