I have three PC's in my home and a windows 2003 file server I just setup. The three PC's have windows xp home so I can't get them on a domain.

Is it possible to use external computers for usernames to use for folder security? Let me explain by using my situation:

Computer 1:
Name: Chris
Username accessing pc:
Chris

Computer 2:
Name:PC101
Usernames accessing PC:
mom
mary
john

Computer 3: Laptop
Usernames acessing PC
Chris
Mom

Server:
Folder #1:
Shared folder
Users I want to access it:
Chris\Chris
pc101\mom
pc101\john
pc101\mary
laptop\chris
laptop\mom

Private folder for me:
Users allowed to access
chris\chris
laptop\chris

ect....

So is this possible?

Although XP home cannot be added to a domain. It CAN access domain resources. You can map a drive or folder and the user can access this using a DOMAIN user account.

OP has stated he has XPHome, which cannot be joined to a Domain.

cd you said "Is it possible to use external computers for usernames to use for folder security?" No. You can't set permissions based on computers.

Look here:

http://support.microsoft.com/kb/304040

and here:

http://support.microsoft.com/kb/814004

Just out of curiosity, why did you purchase Server when you can't really utilize all the features? Seems like a waste of money to me.

"So won’t you give this man his wings
What a shame
To have to beg you to see
We’re not all the same
What a shame" - Shinedown

I got Windows Server 2003 Standard Free from Microsoft Dreamspark, because I am a student.

See this link:
https://downloads.channel8.msdn.com/