That was a great and concise tutorial. To add to it since it is set up so well, since thin clients can access apps on a server via a second server known as a terminal server, then you can see the real usefulness in a terminal server.
A remote office can use computers (hopefully thick ones or regular desktops) and RDC (remote desktop connection) formerly known as RDP (remote desktop protocol) can remote into the terminal server and use AC or any app remotely. Of course, each computer needs a separate CAL.