T erminal Services (TS) for Windows Server 2008 allows a minimal computer called
a thin client or a terminal to connect to a Windows server, display a Windows
desktop, and use Windows remotely, with Windows and its applications running
on the server. The thin client (called simply "client" in much of this chapter) can run
Windows XP, Server 2003, Vista, or Server 2008, or, with third-party software, a number
of other operating systems (OSs). It can even access the server over the Internet. Only
the user interface runs on the client, which returns keystrokes and mouse clicks to the
server. The client computer can have a slower processor, a modest amount of memory,
and a small hard disk or even no hard disk. To the application running on the server, the
user appears to be on that machine, and to clients, the application appears to be running
on their machines, given a reasonable network speed. Multiple terminal sessions can be
running on the server, but each client sees only its own session. A good use of thin clients
with TS is one where the client is used for a single purpose, such as order entry, ticketing,
or inventory tracking, where it is beneficial for the application and its related database
to be on a server.
TS has two distinct modes that it handles:
▼
Applications Server Mode, which allows a client computer to display a Windows
desktop and run applications remotely from a server
▲
Remote Administration Mode, which provides the means to remotely
administer a computer running Windows Server 2008 including Internet
Information Services (IIS)
TS is an integral part of Windows Server 2008, as it was in Windows Server 2003,
and provides a powerful, full-capability set of terminal services. Third-party companies,
though, such as Citrix, provide advanced applications in the TS arena that run on
Windows 2003 and 2008 servers. You can reach Citrix at http://www.citrix.com.
TS works with the Transmission Control Protocol/Internet Protocol (TCP/IP), common
to Windows Server 2008 networking and the Internet, and uses the Remote Desktop
Protocol (RDP). RDP is a broad protocol facilitating the simultaneous transmission
of a wide range of data, including user, application, licensing, and encryption information.
RDP also has the capability to transmit audio and video information.
The two modes are accomplished in Windows Server 2008 using nine separate components
of
▼
TS Manager, which provides the administrative functions for TS and Terminal
Server including viewing and controlling user sessions and processes.
■TS Configuration, which allows you to determine the TS connections that are
on the computer and their properties, as well as the server settings.
■
Terminal Server, which is a TS role service that provides the central core of TS
that allows multitasking on a server.
■
TS RemoteApp, which is an element of Terminal Server that provides remote
access to standard Windows programs.
■
TS Web Access, which is installed as a TS role service, but is really an
Internet Information Services (IIS) web application that provides access to TS
RemoteApp by use of a web browser.
■
TS Licensing, which is a TS role service that provides for client licensing of
Windows TS.
■
TS Gateway, which is a TS role service that provides secure, encrypted access
to resources on a LAN connected to the Terminal Server by remote users.
■
TS Session Broker, which is a TS role service that provides load balancing
among several terminal servers (a "farm") and reconnects a TS client to an
existing session in that farm.
▲
Remote Desktop Connection 6.0, which is separate client software that is
preinstalled on Windows Server 2008 and Windows Vista Business and Ultimate,
and can be downloaded for Windows Server 2003 SP1 or SP2 and Windows XP
Professional SP2, that allows the client to connect to and use TS. Remote Desktop
Connection 6.0 is required to use Windows Server 2008 Terminal Services,
Terminal Server, TS RemoteApp, TS Web Access, and TS Gateway.
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