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} The ConfigurationSettings class finds the appropriate section handler The section handler then looks in the current app configuration data for the appSettings section (parts of which can be inherited from machineconfig), parses the contents, builds the NameValueCollection, and returns it Because different section handlers can return different data types based on the data provided in their sections, the GetConfig method returns an object that must be cast to the appropriate type As a shortcut that doesn't require the cast, the ConfigurationSettings class provides built-in support for the appSettings section via the AppSettings property: static void Main() { NameValueCollection settings = ConfigurationSettingsAppSettings; MessageBoxShow(settings["pi"]); } When you've got the settings collection, you can access the string values using the key as an indexer key If you'd like typed data (pi is not much good as a string), you can manually parse the string using the type in question Alternatively, you can use the AppSettingsReader class (also from the SystemConfiguration namespace) to provide typed access to the appSettings values: static void Main() { // Parse the value manually NameValueCollection settings = ConfigurationSettingsAppSettings; Decimal pi1 = DecimalParse(settings["pi"]); // Let AppSettingsReader parse the value AppSettingsReader reader = new AppSettingsReader(); Decimal pi2 = (Decimal)readerGetValue("pi", typeof(Decimal)); } The AppSettingsReader class's GetValue method uses NET type conversion classes to do its work, making things a bit easier for you if your application's config file uses different types

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

FRS relied entirely on the NTFS Update Sequence Number (USN) journal, which is a xed-size le that records all changes that are made to an NTFS-formatted partition The FRS would monitor the NTFS USN journal for closed les in the folders that were replicated by FRS Because the NTFS journal is a xed size, at a certain point, the le wraps around and starts overwriting previous journal entries This is where the problem creeps in With a large NTFS partition that has lots of les and lots of changes, the journal log could wrap before all the changes were replicated, at which point FRS would break, and manual intervention would be needed Due to the problems with the NTFS journaling and the le-level replication, many environments could not use the DFS replication Instead, they had to use other replication technologies, such as a manual copy using the robust le copy (robocopy) utility at periodic intervals, or even xcopy Microsoft nally addressed these problems by introducing DFSR technology, which uses a new replication process known as Remote Differential Compression (RDC) that performs compression and delta-based replication Only the changes in a le are replicated, which means if 20KB of a 10MB le changes, only the 20KB of changes are replicated This saves bandwidth and enables all the various replica members to be kept in sync faster This process is shown in Figure 15-4, where only the changed portion of the le is copied to the other replica member

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