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The second type of security that can be set on an application is role-based security This involves determining the type of user (or the role that the user plays) and granting permission or denying permission based on that role For example, you may have an application that requires managers to perform a certain duty However, clerks may be using the same application but are not permitted to perform the same duty These restrictions may be as simple as letting a manager change customer details, and letting only a clerk view those details By implementing role-based security, you can control this Role-based security is controlled by passing information about the principal (the identity) of the caller on the current thread This can take the form of a Windows account, or some other form The application then makes decisions based on the principal and the role to which the user has been assigned The role is a collection of principals that have the same permissions for example, all clerks would be one role, all managers would be another role Note that a principal can be a member of several roles The manager may also be a member of the clerk role, thereby permitting the manager to view customer details as well as change them The following program demonstrates the use of principals and role-based security

using System; using SystemThreading; using SystemSecurityPrincipal; public class TestRoleBasedSecurity { public static void Main() { AppDomainCurrentDomainSetPrincipalPolicy ( PrincipalPolicyWindowsPrincipal); WindowsPrincipal w = (WindowsPrincipal) ThreadCurrentPrincipal; if (wIsInRole(WindowsBuiltInRoleAdministrator)) { // execute code for Administrators } } }

Fiberglass is a strong material that can be made to look like natural wood, and offers good resistance to warping and weathering A True B False

Notice that the IsInRole() method tests for a built-in Windows role namely Administrator This is one of the ways you can use roles You can also create generic roles using the GenericIdentity and GenericPrincipal classes; however, that is outside of the scope of the Windows exam For the exam, just be aware of two key elements of role-based security: Identity This can be as simple as the user s login name It could also be a Passport account or a cookie-authenticated user (for an ASPNET application) Principal This is the role (or roles) to which the user belongs

EXAM TIP Role-based security can be useful for Windows 2000 accounts, Microsoft Passport, or user directories, to manage access to resources You may also be tested on your knowledge of the difference between authentication and authorization These are the basics, in a nutshell: Authentication is the process of verifying a user s identity Examples of processes that will find the user s identity and then validate them are operating system user names and Microsoft Passport These are then validated against such mechanisms as Kerberos (Windows 2000 authentication protocol) or NTLM (Windows NT authentication protocol) Authorization is the process of finding out whether the authenticated user can proceed with an activity This happens after the authentication process and uses the role to which the user is assigned to determine which resources the user may access

PART IV There are a few things that can be done to enhance the appearance and the user friendliness of your application For example, you may give assistance to the user of your application through ToolTips, context-sensitive help, or Help menus You may also wish to add accessibility features to your application assistance for vision-, hearing-, or mobility-impaired people In this section, we will explore these tools

Steel doors offer little protection against fire and break-in attempts, compared to wood doors A True B False

Adding help to a Windows application is a necessity Although you might be very familiar with moving around your forms, the user is not As a rule, you should try to make your forms as consistent in nature as possible If you usually put a button in a certain location, try to be sure that it is located there for all related applications Just as Microsoft does, ensure that your menus are positioned and labeled following Windows standards File, Edit, View, and so forth In addition to these techniques, provide assistance to the user with ToolTips, Help menus, and context-sensitive help

In order to provide assistance through the use of ToolTips, you must add the ToolTip control to each form Figure 24-8 demonstrates the college application form with an instance of the ToolTip control added to the form

Figure 24-8

What kind of door consists of metal wrapped around wood with a strong frame ______________________________________________