OT Thin Clients

[Norm]

A friend of mine and I were discussing setting up a server to service 
our family members via a Thin Client from lap tops.
While a thin client into a linux server at a command line level is no 
big issue, in this case the users must be able to log onto a gui 
interface level and use their personal desktop.  After looking at things 
a bit it seems that it is possible for only one user at a time to log on 
to an xinterface, we had thought that it might be possible to connect to 
isolated workspaces, are we missing something in the process?