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Windows XP Professional offers an easy way to view which permissions are effectively granted to any specified user or group for the current object. View this information in the Effective Permissions dialog box. Effective permissions are the result of combining permissions, both allowed and denied, from all matching entries, whether explicit or inherited. Matching entries name either the user or group directly, or a group in which the specified user or group is a member. The effective permissions are indicated by a check mark next to each permission granted to the user or group. Figure 13-2 shows the permissions assigned to the Art folder for user2.

Figure 13-2

Although NTFS provides access control to individual files and folders, users can perform certain actions even if permissions are set on a file or folder to prevent access. For example, you have a folder (MyFolder) containing a file (File1), and you grant Full Control to a user for the folder MyFolder. If you deny Full Control for File1, the user can still delete File1 because the Full Control permission for MyFolder consists of a set of special permissions that include Delete Subfolders and Files. This special permission allows the user to delete files within the folder, even if the special permission Delete has been denied (or not granted) to the user for File1. View the special permissions assigned to a file or folder by clicking the Edit button in the Advanced Security Settings dialog box.

There might come a time when you want to stop using a particular offline file or folder. In this case, all you need to do is right-click the offline file or folder and choose Make Available Offline so that the option is no longer selected. If you want to stop using Offline Files altogether, clear the Enable Offline Files option on the Offline Files tab of Folder Options.

Not being a very skilled user interface designer myself, I ve always had problems working on a program with many controls to align. Even more difficult was trying to get the alignment right the first time I dropped the controls onto the form. I ve always had to go to the Properties window and align the controls manually by entering their x and y coordinates, which slows down the development process quite a bit! One of the philosophies the Visual C# 2008 team had in mind when creating this awesome new product was to make sure you didn t have to perform multiple steps at several different places to accomplish a simple task. And they succeeded with a lot of important features built into the designer; one of these is the snap lines feature with which you can easily align objects on the designer surface. Let s do an exercise so you can see the snap lines feature in action.

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To prevent File1 from being deleted, you must ensure that the user is not granted the Delete Subfolders and Files special permission on the parent folder (MyFolder), explicitly or through group membership. To do this, use the Effective Permissions tab to view the folder s special permissions that are granted to the user. If Delete Subfolders and Files is selected, the user can delete all files within the folder. To give the user access to the folder and its files without the ability to delete them, clear the Full Control check box and ensure that the user is not also granted Full Control via membership in another group. Although explicit permissions override inherited permissions, you cannot deny Full Control without also denying Modify, Read & Execute, List Folder Contents, Read, and Write. To prevent a user who is granted Full Control, by way of inherited group permissions, from deleting MyFolder and its files, do one of the following:

If the files you are sharing reside on a Windows 2000 or Windows XP computer, you can adjust their caching settings. Although offline folders and files are selected by users working from their local computers, caching options are set as part of the sharing process on the serving computers. The following caching options can be applied to network shares:

Explicitly deny the Delete Subfolders and Files special permission for either the group or for the individual user. Remove inheritance from the folder and then reset the permissions for the group.