terminal services

Using a Remote Terminal Licensing Server

There is a tutorial about how to install a Terminal Services Licensing Server on a Windows 2003 Server that you can find here:

Install Windows 2003 Terminal Service Licenses

Install Windws 2003 Terminal Service Licenses (Remote Desktop)

By default in Windows Server 2003, you can be logged in via Remote Desktop (formerly known as Terminal Services or "TS" if you're "really cool.") up to 2 times. Basically, you can login as administrator or other account that belongs to the Remote Desktop Users group 2 times simultaneously without additional licenses.