syn: I don't think that is it. I think that still only 5 specific chosen users can use the per user cals, they would have to be reassigned for a different set of 5 to connect.
Here is a post with more: http://forums.microsoft.com/Te.....;SiteID=17
How you assign a license to user, I don't know.
I've been searching but so far Microsoft's information on this topic is not very helpful.
Edit: So far from what I've read it appears that Windows Server 2003 doesn't keep track of per user cal usage, it's up the server administrator to make sure only the specific 5 users the cals were for, connect to the server.
Also that will apparently be changed in Windows Server 2008.