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Figure 17-6. Windows adds a downward arrow to the icons for files and folders about to be written to a CD.

To maintain a software deployment, it might be necessary to redeploy, upgrade, or remove an application at some point in the software life cycle. You can redeploy an application previously deployed with Group Policy if there are small changes that need to be made to the original software deployment configuration. You can redeploy an application by using the Software Installation extension. To upgrade software deployed with Group Policy, you must first create a Windows Installer package that contains the upgrade and then configure the upgrade in the Upgrades tab in the Properties dialog box for the package. To remove software deployed with Group Policy, you must choose whether to uninstall the software from all users and computers or to merely prevent new installations of the software by using the Software Installation extension.

Fortunately, solutions exist. In section 5.1.1, we ll demonstrate how you can query nongeneric collections thanks to the Cast and OfType query operators. Let s now review what LINQ allows us to do with all these collections.

Notice that the CD folder does not tell you the total size of the objects in the staging area. (Even if you display the status bar and select everything in the folder, it doesn t provide this information.) To find out whether you re about to try copying more data than will fit on the intended CD, press Ctrl+A, and then right-click an item and choose Properties from the shortcut menu. For your files to fit on a standard CD, this total should be less than 650 MB. With a high-capacity CD, you can go as high as 850 MB.

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Make sure that you have plenty of disk space Burning CDs with Windows XP gobbles up alarming amounts of disk space and demands careful attention if you want to avoid low disk space errors. When you drag files or folders into the CD drive window and add them to the Files Ready To Be Written To The CD list, Windows makes a copy of each file in the %UserProfile%\Local Settings\Application Data\Microsoft\CD Burning folder. If you re planning to fill a 700-MB CD with files that are already stored on your computer, that means you ll use up an additional 700 MB of space just making these copies. Then, when you go to write the CD, Windows creates a CD image from the files stored in the CD Burning folder, using an additional chunk of space on a drive or volume you specify in the CD drive properties dialog box. This file, which is hidden, appears in the root of the specified drive under the name CD Burning Stash File. Although Windows cleans up after itself after writing the CD, the net effect causes your system to use temporary space equal to approximately twice the size of the files you plan to copy.

In order to maintain software deployed with Group Policy, you must be able to trou bleshoot the software deployment. Troubleshooting a software deployment involves using the Resultant Set Of Policy Wizard, the Gpresult and Gpupdate command-line tools, the Event Viewer, and log files to solve policy-related problems. This lesson shows you how to work with these tools to troubleshoot software deployed with Group Policy.

Windows XP writes audio CDs in the Red Book format and data CDs in a combination of the ISO 9660 and Joliet formats. This means that audio CDs can be played in conventional audio CD players and data CDs can be read on systems running other operating systems (Macintosh, for example) and older versions of Windows or MS-DOS. When you click Write These Files To CD, the CD Writing Wizard appears.

As an administrator, it will likely be your task to find solutions to problems with soft-