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Failure to set DACLs or setting DACLs improperly might have undesirable consequences. For example, an empty DACL, where neither Allow nor Deny has been configured, denies access to all accounts. On the other hand, if there is no DACL then all accounts have full access.

Figure 19-2. Configure basic infrared operations on the Infrared tab of the Wireless Link dialog box.

Inheritance is one of the primary tools for managing access control. By default, permissions assigned to a parent folder are inherited by the subfolders and files that are contained in the parent folder. You can block inheritance, however, so that permission changes made to parent folders will not affect child folders and files. This is useful when permissions on individual files need to be more restrictive than the permissions that apply to a parent folder, for example. To block permission changes made to parent folders from affecting child folders and files 1. Open the Advanced Security Settings page for the file or folder. 2. Click the Permissions tab. 3. Clear the Inherit from parent the permission entries that apply to child objects. Include these with entries explicitly defined here check box. 4. Click OK.

17:

Permissions can also be denied. By denying a user or group permission to a folder or file, you are denying a specific level of access regardless of the other permissions assigned to the user or group. Even if a user has access permissions to the file or folder as a member of one group, denying permission to the user as a member of a second group blocks any other permissions the user has.

On the Image Transfer tab of the Wireless Link dialog box, shown in Figure 19-3, you can choose to use the wireless link to transfer images from a digital camera to your computer. Simply enable the first option, and then choose a default storage location for the picture files. Also notice the option Explore Location After Receiving Pictures. If you select this option, the folder in which the pictures are stored will automatically open after you have received the files. The Hardware tab of the Wireless Link dialog box lists the infrared device that is installed. It displays basic information about the device, such as the manufacturer, COM port location, and the current device status. If you select the device and click the Properties button, a properties dialog box opens the same dialog box you see from within Device Manager. You ll see the standard General and Driver tabs, but depending on your hardware, there might also be an IrDA Settings or Advanced tab that will let you further configure your port. Figure 19-4 shows the IrDA Settings tab for a serial infrared device and the Advanced tab for a FIR device. On these tabs, you can set the maximum connection rate and, for the serial device, select the COM port. The highest possible speeds are selected by default for both devices. Notice that the serial device tops out at 115.2 Kbps, whereas the FIR device can reach 4,000 Kbps (4 Mbps).

If you choose to install the software in a folder other than the recommended default, you might have problems working with some of the paths and files mentioned later in the book. If you do install in a different location, rest assured I ll give you some cautionary notes whenever you might run into problems.

You can take ownership of a resource if you are a member of the Administrators group. It is important for administrators to take full ownership or reassign ownership for key resources so that if an employee creates a resource such as a file share and then leaves the organization, that resource remains accessible. To view the ownership information associated with a resource 1. Right-click the file or folder, and select Properties from the secondary menu. 2. On the Security tab, click the Advanced button to view the Advanced Security Settings of the resource. 3. Click the Owner tab. Note

Figure 17-6