Directory Services

Scope of Groups

Each security and distribution group has a scope:

Domains from which members can be added to the group
Domains where the group can be used to grant permissions
Domains where the group can be nested in other groups.

There are three scopes for groups, as shown in the following table.

Scope	Members	Grant Permissions	Member of Other Groups
Universal	From any Windows NT/Windows 2000 domain in the forest: Universal Groups, Global Groups and users (including contacts) from any domain in the forest.	On any domain in the forest	Can be a member of the following groups in the forest: Local Groups and Universal Groups.
Global	Only from the domain containing the group: Global Groups and users (including contacts) from the domain containing the group.	On any domain in the forest	Can be a member of any group in the forest: Global Groups, Local Groups, and Universal Groups.
Domain Local	From any domain in the forest: Global Groups, Universal Groups, and users (including contacts) from any domain in the forest. Domain local groups from the domain containing the group.	Only on the domain containing the group	Only can be a member of Local Groups in the domain containing the group.

Scope

Members

Grant Permissions

Member of Other Groups

Universal

From any Windows NT/Windows 2000 domain in the forest:

Universal Groups, Global Groups and users (including contacts) from any domain in the forest.

On any domain in the forest

Can be a member of the following groups in the forest:

Local Groups and Universal Groups.

Global

Only from the domain containing the group:

Global Groups and users (including contacts) from the domain containing the group.

On any domain in the forest

Can be a member of any group in the forest:

Global Groups, Local Groups, and Universal Groups.

Domain Local

From any domain in the forest:

Global Groups, Universal Groups, and users (including contacts) from any domain in the forest.

Domain local groups from the domain containing the group.

Only on the domain containing the group

Only can be a member of Local Groups in the domain containing the group.

If you have multiple forests, users from one forest cannot be placed in groups in another, and groups from one forest cannot be given permissions in another.

In short, a universal group can contain users and groups from any domain and can be used for access control in any domain. A global group can contain only users and groups from a single domain and can be used for access control on any domain. A domain local group can contain users and groups from any domain and can only be used for access control on a single domain.