I wrote another article for howtonetworking.com.
Differences between Remote Desktop Connection in Windows XP and Terminal Services in Windows Server (Beginner Level)
http://howtonetworking.com/RemoteAccess/rdc&TS1.htm
The article describes the differences between RDC in Windows XP and Terminal Services in Windows Server from inside and outside view.
You may be interested to take a look at my new How-To article at howtonetworking.com:
How to Use Terminal Services Manager (Beginner Level)
http://www.howtonetworking.com/RemoteAccess/tsmanager.htm
The article describes how to use the Terminal Services Manager MMC in Windows Server 2003 to perform basic and some advanced Terminal Services sessions management such as connecting / disconnecting to sessions, logging of and remote control users' sessions and managing the processes in the users' sessions, etc.