It is true for all PCs. There are six versions for Vista (in my opinion a marketing calamity). Why they don't just go with one like Mac, or maybe Home and Business and leave it at that. There is Start (for 3rd world nations), Home Basic ($40 cheaper than Home Premium and missing much of Premium's functionality), Vista Home Premium, Vista Ultimate, Vista Business and Vista Enterprise. ALL can do P2P, only the latter three can connect to a domain or Active Directory. If you want to do any type of networking such as RDC or domain, etc., you will want to at least have Vista Business.
If you have 10 workstations and 1 server, whichever is not the latter three will NOT be able to connect to a domain. But, if you are peer to peer, it doesn't really matter.
The big difference is that a good deal of the RAM you install goes to the Vista OS. With just 1GB of RAM, you will spend a lot of time watching that "cool" blue circle rotate clockwise on your PC.
