Terminal Services full

Terminal Services Since its introduction in the early 1990s, Windows Terminal Services was developed in parallel with the evolution of the Windows platform itself. Similar to UNIX and X Windows
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Terminal Services fullTerminal ServicesSince its introduction in the early 1990s, Windows Terminal Services was developed inparallel with the evolution of the Windows platform itself. Similar to UNIX and XWindows, Windows Terminal Services provide a server-centric computing model, butensure much greater flexibility for accessing Win32 applications. The main benefit ofWindows Terminal Services deployment is the fact that it enables you to provide accessto specific Win32 applications without the necessity of installing those applications onevery workstation within your Windows environment. Windows Terminal Services havebeen popular since 1995, when Citrix introduced its WinFrame product that provided fullaccess to Windows NT 3.51 for the users of Windows terminals - so-called thin-clientdevices specially designed to provide users with access to Windows Terminal Services.Note Windows terminals or thin-client devices are solid-state devices that have their OS burned into ROM (i.e., they have no moving parts). Such devices are exclusively used for communicating with terminal servers, UNIX servers, or mainframes. Typically, they run Windows CE or embedded Linux.Unfortunately, up to now many administrators have considered Terminal Services to berather difficult to deploy and limited in functionality and application support. This ismainly due to the fact that Windows NT 4.0 Terminal Server Edition (WTS) representeda separate operating system rather than a Windows NT 4.0 Server add-on. However, withthe release of Windows 2000, Terminal Services became an integral part of the OS itself,including Windows 2000 Server, Windows 2000 Advanced Server and Windows 2000Datacenter Server. Products of the Windows Server 2003 family, in turn, offer severalenhancements to Terminal Services, which will be covered later in this chapter.Furthermore, most contemporary programs that comply with the Windows Logorequirements can run in a terminal server environment with little or no modifications.Therefore, in todays computing environment Terminal Services can be successfullyutilized for achieving the following administrative goals: Desktop replacement. Windows 2000/Windows Server 2003 Terminal Services can allow you to completely eliminate standard PCs and replace them with thin- client devices. When considering this approach, one must carefully weigh its benefits (such as the elimination of end-node support, reduced power consumption, increased security, and rapid application deployment) against its potential drawbacks (for example, increased initial deployment costs for purchasing thin-client devices and robust servers, reduction of end-user personalization, limited sound and multimedia capabilities). Remote Access and Remote Administration. Remote access can be rather beneficial for large corporations having a large number of remote or migrating users, such as telecommuters, travelling executives, and so on.Currently, there are many changes being introduced into Terminal Services technology.One of the most obvious ones, introduced with Windows Server 2003, is the fact thatnow it is not necessary to install Terminal Server for remote administration of yourserver. Remote Desktop for Administration is installed by default. To use RemoteDesktop for Administration, you must first enable remote connections. To enable ordisable remote connections to your server, proceed as follows: 1. Start the System applet on the Control Panel, and go to the Remote tab (Fig. 8.22). Figure 8.22: The Remote tab of the System Properties window 2. In the Remote Desktop option group, set the Allow users to connect remotely to your computer check box, and then click OK.Note You must be logged on as a member of the Administrators group to enable or disable Remote Desktop for Administration.Among the most significant changes that have been made in Terminal Servicestechnology is the addition of the new Remote Desktop client, included with Windows XPand products of the Windows Server 2003 family (Fig. 8.23). This new client is based onthe newer version of the Microsoft RDP protocol (Microsoft RDP v. 5.2).Figure 8.23: The Remote Desktop Connection windowNote The traditional computing model is based on the TCP/IP protocol stack for transferring data between workstations and servers. Terminal services, however, have very specific needs for network link im-plementation, since only video information, keyboard, and mouse clicks are communicated, while all data processing takes place on the server. Two main protocols have been developed for this model - ICA (developed by Citrix) and RDP (developed by Microsoft). Windows 2000 Terminal Services uses RDP v. 5, which provides additional functionality to its predecessor, RDP v. 4.0 (implemented in ...