Sharing a PC between 2 users

At my company I need to share a Windows 2000 PC by 2 users (different shifts). They logon to a domain, so they have to type their name and password each time they logon.
I would like to have a way of selecting name from a list rather than typing it, but I couldn’t find a way of doing so.
Does anyone know of a way to do that?
Thanks.
Manuel Figueiredo