Use NT or Win2k with SME as the domain controller. If local accounts do not exist on the windows boxes, only the administrator or a domain user will be able to log in.
If you use SME as a domain controller, be advised to move the SME\domain users from the local administrators group to the power users group. I would also create an account "root" with the same SME password and put that account in the administrators group. You can then remove administer that box.
Good luck