[Thinkster]

Let's say I have a user named 'Bill' with Administrator privelages on a local machine. I will find a sub-folder in Documents & Settings named 'Bill'.
Now, I want to add the computer Bill is using to the Domain named 'ETVCORP', once I join the domain with the proper credentials, I find a new sub-folder in Documents & Settings named 'Bill.etvcorp'

What are the differences between these two folders? And how can I be sure that Bill's local account settings, prefernces, etc. will rollover to the bill.etvcorp account??
Also, I want to make sure that once Bill's computer is on the domain that he no longer has administrative priveledges.

[Doc Symbiosis]

The folder Bill contains the profile, which is used, when Bill logs on locally with administrative rights. The folder Bill.etvcorp contains the profile which is used, when Bill logs on to domain.

When you want to have both users to use the same profiledirectory, you first have to edit the adequate key in HKLM\Software\Microsft\Windows NT\CurrentVersion\Profilelist. There you have to locate the key ProfileimagePath, which has the value Bill.etvcorp and change it to bill.
Secondly you have to change the security settings of the bill directory, so that the domainuser Bill has full access to it.

I never tried this, but I think, that it should work without any problems. I hope the description is detailed enough, because it's a little hard to describe.