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and then makes the file available offline, another user who tries to open the offline version of the file on the user s computer is denied access, just as if the second user tried to open the file directly on the network share. This type of security is applied to offline files regardless of the formatting of the user s hard disk. Thus, if you set permissions on a file on a network share that is formatted to use NTFS and you make that file available offline on a computer that has a FAT or FAT32 drive, the permissions carry over to the offline version of the file, even though the drive is formatted to use FAT or FAT32.

You can also customize the Internet Explorer toolbar by selecting the buttons that appear. To customize the Standard Buttons toolbar, choose View, Toolbars, Customize. In the Customize Toolbar dialog box, shown in Figure 6-23, you can see the toolbar buttons that are available to you, and you can see the current toolbar buttons.

You can secure data on portable computers by encrypting the offline files. Windows XP Professional provides Encrypting File System (EFS) support for Offline Files. The local cache of Offline Files can be encrypted if the cache directory resides on an NTFS volume. When the cache is encrypted, the local copy of a cached file is automatically encrypted. To encrypt offline files 1. In Folder Options, click the Offline Files tab. 2. Select the Encrypt Offline files to secure data check box. You can also use Group Policy to apply this option to groups of users. In the Group Policy snap-in, go to Computer Configuration\Administrative Templates\Network\ Offline Files. Offline files stored on local hard disks are secured by EFS; however, the files are encrypted in the system context and the encryption applies to all users of the local computer. If both the local computer and the remote computer where the files are stored are encrypted, files are encrypted at all times. If the local computer is encrypted but the remote location of the files is not, the files are encrypted while they are stored locally. If the remote location is encrypted and the local computer is not, however, you are warned when you try to make a file available offline that it will not be encrypted on the local computer. You can override the default and make the files available; when you attempt to synchronize the files, the local copy will be deleted.

3. Expand a category (Standard floppy disk controller, for example), and then doubleclick a device. 4. Click the Driver tab, and then click Roll Back Driver. You are prompted to confirm that you want to overwrite the current driver. Click Yes to roll back the driver. The roll back process proceeds, or you are notified that an older driver is not available. Tip

You can also open the System Properties box from the Start menu by clicking Run and typing sysdm.cpl in the Run dialog box. Some Control Panel tools are stored in the systemroot\System32 folder and use a .cpl file name extension. Start frequently used Control Panel tools from the Run dialog box or by creating shortcuts. Other frequently used files include Appwiz.cpl (Add or Remove Programs), Hdwwiz.cpl (Add Hardware Wizard), Mmsys.cpl (Sounds and Audio Devices Properties), Nusrmgr.cpl (User Accounts), and Powercfg.cpl (Power Options Properties).

Figure 6-23. Use the Customize Toolbar dialog box to select which buttons appear on the Standard Buttons toolbar in Internet Explorer.

For more information about Device Driver Roll Back and about using System Information to check for unsigned drivers, see Windows XP Professional Help and Support Center, and see also Appendix C, Tools for Troubleshooting, in this book. See articles 283657, How To Use the Roll Back Driver Feature in Windows XP, and 306546, How to Use the Driver Roll Back Feature to Restore a Previous Version of a Device Driver in Windows XP, in the Microsoft Knowledge Base at http://support.microsoft.com.