This article describes how to use the Active Directory Replication Monitor (ReplMon.exe) tool to determine the servers that hold the operations master roles in a forest as well as the domain controllers and global catalog servers for the forest.The five operations master roles that are defined in Active Directory are:
Domain naming master
Relative identifier (RID) master
Primary domain controller (PDC) emulator
There is a very quick method to determine which servers in the forest hold these roles by using Active Directory Replication Monitor.
The Setup program that installs Active Directory Replication Monitor (and other useful support tools) is available on the Windows 2000 Server CD-ROM under the \Support\Tools\Setup.exe folder. When this tool is installed, you can start it if you click Start, point to Programs, click Support Tools, click Tools, and then click Active Directory Replication Monitor.