Samba as a PDC, index Profiles, Policies and Logon Scripts. Profiles NT Profiles should work if you have followed the setup so far. A user's profile contains a whole lot of their personal settings, the contents of their desktop, personal 'My Documents' and so on. When they log off, all of the profile is copied to their directory on the server and is downloaded again when they logon on again, possibly on another client machine.
Users let their profiles get too big and then complain about how long it takes to log on each time.
Policies are an easy way to make or enforce specific characteristics across your network. You create a ntconfig.pol file and every time someone logs on with their NTws, the settings you put in ntconfig.pol are applied to the NTws. Perhaps you want to set the NTws so it does not keep users profiles on the local machine. The only problem is making the ntconfig.pol file itself. You cannot use the policy editor that comes with NTws, you must have a licensed copy of NTServer.