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To understand the basic principles of access control, it is necessary to understand how the following terms are defined in the context of the access control model for Windows XP Professional. Security principal In Windows XP Professional, any entity that can be authenticated. A user, group, computer, or service can be a security principal. Security principals have accounts. Local accounts are managed by the Local Security Accounts Manager (SAM) on the computer. If the account is in a Microsoft Windows 2000 or Windows Server 2003 domain, it is managed by Active Directory. If the account is in a Microsoft Windows NT version 4.0 domain, it is managed by a SAM database on the primary domain controller. Security identifier (SID) A value that uniquely identifies a user, group, service, or computer account within an enterprise. Every account is issued a SID when it is created. Access control mechanisms in Windows XP Professional identify security principals by SID rather than by name. Security context Information that describes a particular security principal s identity and capabilities on a computer. In Windows XP Professional, all users in an organization exist in a specific security context that is redefined every time they log on. All activities, such as installing or running applications, take place in this security context. The security subsystem uses the security context to determine what a process and its threads of execution can do to objects on the computer, and who will be held accountable for what they have done.

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provide wireless Internet access on open networks. These areas, called hot spots, give mobile users access to the Internet on the users own computers. Because Windows XP can automatically configure access to the wireless network, you can essentially step off an airplane, turn on your laptop, and access the Internet. After you arrive and check in to your hotel, you can resume your Internet connection and continue to access it while attending a conference. If you have a VPN or other remote access connection via the Internet to your private network, you can access your personal documents as well.

Access token A data structure containing the SID for a security principal, SIDs for the groups that the security principal belongs to, and a list of the security principal s rights on the local computer An access token is created for every security principal that logs on locally at the computer or remotely through a network connection Each process has a primary access token that it inherits by default from its creating process The access token provides a security context for the security principal s actions on the computer It also provides a security context for any application threads that act on the security principal s behalf Object Any resource that can be manipulated by a program or process Objects include resources that you can see through the user interface, such as files, folders, printers, registry subkeys and entries, Active Directory objects, and the Microsoft Windows desktop.

They also include resources that you cannot see, such as sessions, processes, threads, and access tokens An object can function as a logical container for other objects Inheritance A mechanism for propagating access control information down through a tree of objects In Microsoft Windows NT , an object (such as a file) inherits access control information from its parent object (such as a folder) only when the object is first created In Windows XP Professional, objects inherit access control information not only when they are created, but also when the parent object s access control list changes Owner The only security principal who has an inherent right to allow or deny permission to access an object An object s owner can give another security principal permission to take ownership.

9. Now we just need to attach the same event code to the File, Save menu selection. Double-click the Save choice in the File menu, and add the same code as in step 4. Build the application, and execute it by pressing F5. Type some text in the text boxes, and then save the content to a file by using the Save menu or the Save toolbar button. You should verify that the content of the file your application saved is really what was on the form. So to verify it worked properly, open the file with Visual Studio by clicking File, Open File and then browsing to the location of the saved file. Open it to view its contents. You just handled two events, but I want to point out that you already handled events previously by coding Button1_Click and modifying properties of other controls. For instance, you modified the Text property of the text box controls when you handled the button click. And you were able to do that by using the control s Name property.