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FIGURE 2-27 Overall CPU usage, per-processor usage, and overall system states are available via the Performance tab, which gives a high-level view of the system
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The Networking Tab
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The Networking tab of the Task Manager (see Figure 2-28) allows you to view the network utilization of any connected network This tab shows a graph of network history usage on a variable vertical scale, depending on the bandwidth usage The bottom of the dialog provides more speci c information about the networks, and you can choose View, Select Columns and enable the information you want to see displayed For example, this tab shows whether the data is unicast (Unicast network traf c is data sent to a speci c IP address Nonunicast, for example multicast, data is sent out once by a server to multiple addresses or the entire network as a broadcast) The View menu also provides an option to display separate lines on the graph for bytes in and bytes out in addition to the default line that shows the total number of bytes Figure 2-28 is from a Vista laptop and demonstrates how multiple networks are displayed Notice that the vertical axis of the graph (y) scales is based on the network usage rather than being set in stone between 0 and 100, which makes it dif cult to look for differences because in the local area connection, the network usage never goes above 1%
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FIGURE 2-28 The Networking tab of the Task Manager lists all networks known to the
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The Users Tab
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In Windows XP, the Users tab of the Task Manager was shown only if the machine was in a workgroup and had Fast User Switching enabled In Vista and Windows Server 2008, the Users tab (see Figure 2-29) is always available because switching users is now available under all circumstances
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FIGURE 2-29 All user sessions including a local logged-on sessions that have been
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switched out or Remote Desktop sessions are equal and can be interchanged on the Users tab
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If you have administrator privileges and right-click a user session, you can conduct basic functions such as sending the user a message or logging the user off You can also connect to another session and effectively take it over if you can enter the password for the user, and you can also remotely Control a session to help a user in the event of a problem The only con guration option on this tab, which you access via the Options menu, is to display the user s full name (which would include the user s domain or, if a local account, the name of the computer)
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As mentioned earlier in this chapter, switching users in XP was possible only with workgroup-joined machines Windows Server 2008 and Vista support the ability to switch users without having to log out the current session in all scenarios In addition, disconnected Remote Desktop/Terminal Services-style sessions are treated the same way as switched-out users: They are fully interchangeable For example, say that I log on to a server as John and then switch users to Administrator I can then go home, use Remote Desktop to access the server, log on as John, and take over the switched-out user session, with all open applications available After I disconnect from the remote session and physically switch back to John on the server the next morning, my session state is maintained from my remote session The technology used for user switching and remote sessions is built on Terminal Services technology It consists of running multiple desktop environments, one for each user session, which at a minimum consists of a user-specific explorerexe instance (with an accompanying dwmexe process) When a user logs in either remotely or locally, the Session Manager Subsystem (SMSS) checks to see if an existing session exists for the user logging on, and if it does, the existing session is used; if no session exists, a new one is created When the user wants to nish working, he can log out, which ends the session and any associated processes With a remote desktop session, the user can disconnect (and keep the session from terminating), and with a local session, the user can click Switch User Figure 2-30 shows the process of sharing local and remote sessions In previous versions of Windows, a session 0 was reserved for the local physical console session; however, with Windows Server 2008, session 0 is reserved
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