See How do I Set, View, Change, or Remove File and Folder
Permissions using Windows XP?  Microsoft Knowledge Base Article
308419 contains the following INTRODUCTION:  In Microsoft
Windows XP, special access permissions are customizable sets of
permissions. This means that you can apply special access
permissions to files or folders that are located on NTFS file
system volumes. This article describes how to set, view, change,
or remove special permissions for files and folders.