HP CIFS Server 2.2i Administrator's Guide version A.01.11.01

Primary Domain Controller (PDC) Support
Introduction
Chapter 488
AS/U
Users on a domain member machine can access network resources
within the domain. Some examples of these resources are file and
printer shares and application servers
Domain members do not perform the user authentication for user
logons. Instead, the member sends the credentials to a domain
controller via a secure channel. The domain controller checks the
credentials against those in its database and returns the results to
the member server. Access is granted based on the results returned