Only administrators can use Group Policy to restrict or allow access to specific snap-ins or restrict the ability of a user or group to use author mode in MMC. This applies in a network where Group Policy has been configured.
To set policies for users of a particular computer, you must be an administrator for that computer or have equivalent rights. To set policies for an organizational unit in a domain, you must be an administrator for that domain or have equivalent rights. You cannot use MMC to create computer policies; you can only create user policies.
For more information about Group Policy, see Help.
For more information about applying Group Policy to MMC, see Setting Group Policy in MMC.