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The Permissions tab shows permissions that have been explicitly configured on the object, permissions that have been inherited, where inherited permissions are inherited from, and what child objects they apply to. A new advanced option in the Windows XP Professional, the Effective Permissions tab, allows you to see all the permissions that apply to a security principal for a given object, including the permissions derived from memberships in security groups. The Effective Permissions tab is illustrated in Figure 17-4.

Figure 17-4

cations. If you want to let other devices send files to your computer over the infrared link, make sure this item is selected. Otherwise, users will receive an error message stating Access is denied.

To view the Effective Permissions for a user or group 1. On the Effective Permissions tab, click the Select button to open the Select User or Group dialog box. 2. In the Name box, type the name of the built-in security principal, group, or user, for which you would like to view Effective Permissions. or Click the Object Types button, and then select Built-in security principals, Groups, or Users. 3. Click OK.

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Tip If the security principal is network based, you can click Locations and select a target, or you can type in the domain name together with the group name, such as reskit\users.

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It is important to specify the correct object types and the locations for your search. Failure to do so will result in an error message and the suggestion that you refine your search before searching again.

Access control lists contain a wide variety of ACEs that can be viewed on the Permissions and Effective Permissions tabs. All ACEs include the following access control information:

Silverlight, previously named WPF Everywhere (WPF/E), is a crossbrowser, cross-platform plug-in for delivering the next generation of .NET-based media experiences and rich interactive applications for the Web. From a user s point of view, it is similar to Adobe Flash in behavior, but Silverlight is richer in terms of what you can do and, more specifically, how you can do it. With Silverlight 2.0, for example, you will be able to use your Visual C# skills and expertise to develop Silverlight applications. You can find nice samples, documentation, and much more about Silverlight at http://www. silverlight.net.

A SID that identifies a user or group, such as Alice, the Accounting department, or users in the Denver office A list of special permissions that specify access rights, such as List Folder/Read Data Inheritance information that determines whether new files created in a particular folder will receive access permissions from the parent folder A flag that indicates whether the ACE is an Allow or Deny ACE

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To view a specific ACE 1. Navigate to the Advanced Security Settings page for the file, folder, or object. 2. Double-click the entry or entries you want to view in the Permission entries box. Figure 17-5 shows the ACE that the Users group has for the Windows folder.

Figure 17-5

Part III:

specify a default location where those files are stored. Click the Browse button to help select the location.

The operating system uses the following guidelines to set the DACL in the security descriptors for most types of new securable objects: 1. The new object s DACL is the DACL from the security descriptor specified by the creating process. The operating system merges any inheritable ACEs from the parent object into the DACL. 2. If the creating process does not specify a security descriptor, the operating system builds the object s DACL from inheritable ACEs in the parent object s DACL. For example, in the case of a new file, this might be the inheritable ACEs from the folder in which the file is being created. 3. If the parent object has no inheritable ACEs for example, if the file is being created in the root directory the operating system asks the object manager to provide a default DACL. 4. If the object manager does not provide a default DACL, the operating system checks for a default DACL in the access token belonging to the subject (the user, for example). 5. If the subject s access token does not have a default DACL, the new object is assigned no DACL, which allows Everyone unconditional access. Warning