I've got three identical machines for my 3 kids, running Narwhal, but I'd like to replicate the user accounts across all 3 so anyone can login on any machine without me having to create all accounts on all 3 machines.

Ideally, this would include storing their home directory stuff on a windows server (or one of the 3 machines), and replicating their desktop settings, etc. The windows server is all set up, samba's running, I can map it, etc. I just haven't bothered yet because I didn't want to replicate the same work 9 times. (15 if you include the guest account and my account.)