The Windows Server 2003 operating system family provides a client license management system known as Terminal Server Licensing. This system allows terminal servers to obtain and manage terminal server client access license (TS CAL) tokens for devices and users connecting to a terminal server. Terminal Server Licensing is a component service of Microsoft® Windows Server™ 2003, Standard Edition; Windows Server 2003, Enterprise Edition; and Windows Server 2003, Datacenter Edition. It can manage unlicensed, temporarily licensed, and client-access licensed clients, and supports terminal servers that run Windows Server 2003 as well as the Microsoft Windows® 2000 Server operating system. This greatly simplifies the task of license management for the system administrator, while minimizing under- or over-purchasing of licenses for an organization. Terminal Server Licensing is used only with Terminal Server and not with Remote Desktop for Administration. Terminal Server for Windows Server 2003 (known as Application Server mode in Windows 2000 Server) provides application deployment and management for users on a variety of devices through its application server mode. Each device or user who initiates a session on a terminal server running Windows Server 2003 must be licensed with one of the following: 1. Windows Server 2003 Terminal Server Device Client Access License. 2. Windows Server 2003 Terminal Server User Client Access License. 3. Windows Server 2003 Terminal Server External Connector