Windows 2000 Terminal Services requires a licensing server to manage and distribute TS Client Access Licenses (TSCALS). In a Windows 2000 domain environment, the TS Licensing server must be located on a domain controller. In an NT4 environment, the licensing server can be located on any server in the domain, including the Terminal Server itself.
The licensing server will be activated on all Windows 2000 Terminal Servers, and they all will have licenses installed. Having the TS licensing service installed, activated and in use on the other servers allows them to issue new licenses to users as they log on. In addition, installing, activating and using the Terminal Services Licensing service on all servers help to maintain a common image on all servers.
In an NT4 environment, Terminal Servers locate a licensing server by broadcasting on the network. (In a Windows 2000 environment, the location of a licensing server is stored in the Active Directory.) Appendix A contains a flowchart of how TS licensing works when clients connect to a terminal server.