How to Determine the Schema FSMO Holder in a Forest
1.. Click Start, click Run, type mmc, and then click OK.
2.. On the Console menu, click Add/Remove Snap-in, click Add, double-click
Active Directory Schema, click Close, and then click OK.
3.. Right-click Active Directory Schema in the top left pane, and then
click Operations Masters to view the server holding the schema master role.
NOTE: For the Active Directory Schema snap-in to be available, you may have
to register the Schmmgmt.dll file. To do this, click Start, click Run, type
regsvr32 schmmgmt.dll in the Open box, and then click OK. A message is
displayed that states the registration was successful.
http://support.microsoft.com/default.aspx?scid=kb;en-us;234790 - How to
determine the current FSMO role holders in your forest/domain