Ok, ignore Domain - red herring for what you're doing.
On your desktop right click on the My Computer icon.
Select properties.
Select Computer Name.
Towards the middle of the information is a line that says "Workgroup", this should be the same for both machines once they're set up.
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					Originally Posted by Wayne A
					
				 EDIT:  It think i understand the IP part now, would that be the MAC Addresses of both PC's? | 
	
 Nope.  Ignore that bit.
If you're installing a router you don't need to worry about that, it will give each machine an IP address - nothing you need to worry about honest.
I think I was over complicating things a bit because of the way my machine is set up.