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To promote or Demote a domain controller to a global catalog server, follow these steps:
Just select or deselect the check box of Global Catalog as described at5th line to promote or demote Global Catalog Server.
Follow the picture also as described below
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Every domain controller in a forest stores three full writable directory partitions: a domain directory partition, a schema directory partition, and a configuration directory partition. A Global Catalog is a domain controller that stores these writable directory partitions, as well as a partial, read-only copy of all other domain directory partitions in the forest.
Steps to enable or disable a global catalog
http://technet.microsoft.com/en-us/library/cc977998.aspx
http://technet.microsoft.com/en-us/library/cc728188(v=ws.10).aspx