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Working with files and folders in a zipped folder Figure 17-5 shows a zipped folder in Details view, along with the Choose Details dialog box (choose View, Choose Details). In the figure, the task pane has been replaced by the Folders bar. As you can see, Details view for a zipped folder can offer some useful information about each file. Depending on what you select in the Choose Details box, you can display many properties, including the original and compressed sizes (Size and Packed Size), the compression ratio (Ratio), and whether files have passwords (Has A Password). If you see low numbers in the Ratio column (some file types are much more compressible than others), you might decide that zipping isn t worth the trouble. Note You can use Search Companion to look for file names within zipped folders. But you can t search for file content (specific words or phrases within files) in zipped folders. (For more information about Search Companion, see Locating Files with Search Companion, page 640.)

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Any time complex layers are added, performance can potentially decrease. The architectural dilemma when designing systems is determining the trade-off between performance and maintainability. Working with LINQ is no exception. There is overhead in determining the translation between the LINQ query syntax and the syntax the database understands. This translation requires reflecting on the mapping metadata, parsing the query into an expression tree, and constructing a SQL string based on the results.

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Figure 17-5. Windows Explorer displays an archive s contents as though they resided in a normal folder. The folder itself is a file with the extension .zip.

Domain Controllers A domain controller is a computer running Windows Server 2003 that stores a replica of the domain directory (local domain database). Because a domain can contain one or more domain controllers, each domain controller in a domain has a complete replica of the domain s portion of the directory. A domain controller can service only one domain. A domain controller also authenticates user logon attempts and maintains the security policy for a domain. The following list describes the functions of domain controllers:

Be careful where you save a compressed document after editing When you open a compressed document by double-clicking in Windows Explorer, Windows extracts the document to a temporary hidden folder (a subfolder of %Temp%), then passes a read-only copy of the uncompressed file to its parent application. If you edit the file, you ll need to use Save As, not Save, to preserve your changes. The Save As dialog box might not make it obvious that the proposed folder for your Save As is not the zipped folder from which you opened the original file. Some applications (Microsoft Excel, for example) will actually propose to save the edited version in the temporary folder to which the original file was (temporarily) extracted. If you save your edited file in that location, and you don t happen to have Windows Explorer set to display hidden files and folders, you ll run the risk of being unable to find the file subsequently. To avoid cluttering your disk with hidden temporary files and losing track of files you do want to keep, be sure to save your edits to a working folder. Although Windows does its best to make them look like ordinary folders in Windows Explorer, your zipped folders are really disguised .zip files, not regular file folders. Therefore, you can t save directly from an application into a zipped folder. If you need to edit a document after opening it from a zipped folder, the best thing to do is extract it to some handy location, such as the desktop. Then, when you have finished, drag the document from its new location back into the zipped folder and confirm the overwrite of your original compressed file.

Each domain controller stores a complete copy of all Active Directory information for that domain, manages changes to that information, and replicates those changes to other domain controllers in the same domain Domain controllers in a domain automatically replicate directory information for all objects in the domain to each other When you perform an action that causes an update to Active Directory, you are actually making the change at one of the domain controllers That domain controller then replicates the change to all other domain controllers within the domain You can control replication of traffic between domain controllers in the network by specifying how often replication occurs and the amount of data that each domain controller replicates at one time Domain controllers immediately replicate certain important updates, such as the disabling of a user account.