The Microsoft Windows Terminal Server (WTS) is a server program running on its Windows NT 4.0 (or higher) operating system that provides the graphical user interface (GUI) of the Windows desktop to user terminals that don't have this capability themselves. The latter include the relatively low-cost NetPC or "thin client" that some companies are purchasing as alternatives to the autonomous and more expensive PC with its own operating system and applications. The Windows Terminal Server was code-named "Hydra" during development.
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The Windows Terminal Server has three parts: the multiuser core server itself, the Remote Desktop Protocol that enables the Windows desktop interface to be sent to the terminals by the server, and the Terminal Server Client that goes in each terminal. Users will have access to 32-bit Windows-based applications. The new terminal devices are being made by a number of vendors, including Network Computing Devices and Wyse Technologies. In addition, users of existing PCs running Windows 95 and Windows 3.11 operating systems can also access the Server and its applications. The Terminal Server can also serve terminals and workstations that run UNIX, Macintosh, or DOS operating systems that can't be upgraded to 32-bit Windows.
Co-developed with Citrix, Microsoft's Windows NT 4.0 Terminal Server Edition together with Citrix's MetaFrame product replace Citrix's WinFrame product.