What is the PDC emulator?
The PDC emulator is one of the five operations master roles in Active Directory. It is used in a domain containing non-Active Directory computers.
It processes the password changes from both users and computers, replicates those updates to backup domain controllers, and runs the Domain Master browser.
When a domain user requests a domain controller for authentication, and the domain controller is unable to authenticate the user due to bad password, the request is forwarded to the PDC emulator.
The PDC emulator then verifies the password, and if it finds the updated entry for the requested password, it authenticates the request.
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