Greetingz!
The "Server" edition of Ubuntu 9.10 comes with actual services such as DNS, DHCP, FTP, etc, etc. If you're setting up a lab so people can learn how to setup these services, then you will need the "Server" edition.
As for "remote login", creating accounts with the "useradd" command (check the man page first!) should suffice. From there, just have them use "SSH" (Secure Shell) to login for a command-line login.
You could also setup a VNC service on the server, and give the clients a VNC Viewer (giyf).
Good luck!
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