This is something I should have gotten more clarity on some time ago. In a Windows 2000 Server Active Directory there was always a Primary Domain Controller (PDC). You could/should have Secondary/Tertiary/... Domain Controllers (DCs) to provide fail-over. I remember hearing how Windows 2003 Server changed things so that there is no PDC, there are just DCs - none of which is considered or technically referred to as the PDC.
First, is my general notion about DCs and the lack of PDC's in Windows 2003 Server even remotely correct? If not, I will appreciate any guidance.
Second, if it is true that there is no PDC in a Windows Server 2003 AD, any info, urls, articles that can explain the differences between Domain Controllers in Windows Server 2000 vs. 2003 ADs will be greatly appreciated.