How do I configure a server as a Global Catalog?

Start the Microsoft Management Console (MMC) Active Directory Sites and Services Manager. (From the Start menu, select Programs, Administrative Tools, Active Directory Sites and Services Manager.)

Select the Sites branch.

Select the site that owns the server, and expand the Servers branch.

Select the server you want to configure.

Right-click NTDS Settings, and select Properties.

Select or clear the Global Catalog Server checkbox, which the Screen shows.

Click Apply, OK.