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catalog. They can contain groups from any Active Directory domain, and they can be used to grant access on any computers running Windows 2000, Windows Server 2003, or Windows XP Professional in any domain in the forest. Built-in security principals Built-in security principals, also called special identities, apply to any account that is using the computer in specified ways, such as for Anonymous and Remote logons. Unlike the other types of security groups, built-in security principals do not have specific memberships that you can view or modify, nor do you even see them when you administer groups. However, they are available for use when you assign rights and permissions to group members. The scope of a group determines where in the network you are able to use the group and assign permissions, and the amount of network traffic the group creates. Using the most appropriate group for a task simplifies administration and, in a domain environment, reduces network traffic by reducing the amount of replication required. The following sections discuss the computer local and special identity groups in greater detail.

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Windows XP Professional includes a number of built-in computer local security groups. You can manage the membership of these groups by using the Local Users and Groups snap-in to the Microsoft Management Console (MMC) or by using User Accounts in Control Panel. However, if you are using Windows XP Professional in a stand-alone or workgroup configuration, by using User Accounts in Control Panel you can manage only three of these built-in security groups Administrators, Users (which are also referred to as Limited users), and Guests. If you are using Windows XP Professional in a stand-alone or workgroup configuration and want to use other security groups in addition to these three, you need to manage them from the Local Users and Groups snap-in. The following sections describe the roles and privileges associated with each computer local security group. Administrators Members of this group have total control of the local computer. The default Windows XP Professional security settings do not restrict administrative access to any registry object or file system object. Administrators can perform any and all functions supported by the operating system. Any right that Administrators do not have by default, they can grant to themselves. Warning

If a hacker or virus gains access to a computer while a member of the Administrators group is logged on, the hacker or virus can use the administrator s security context to perform any task on the local computer or, in the case of a network administrator, on the network that the administrator can perform. Impress upon all members of the Administrators group the importance of minimizing the amount of time that they are logged on with these privileges.

When you load an application, you often see something called a splash screen. Some good examples of splash screens are the opening information boxes you see for Microsoft Office and Microsoft Visual Studio 2008. Although the splash screens are often very nice looking, they aren t there just to display the software version and some appealing artwork or to make sure you re not bored. These screens serve a function. Once you ve started an application, a lot of processing is happening; for instance, the application is connecting to databases, populating controls with data from the database, getting saved configurations for user interface (UI) preferences, and so on. Displaying the splash screen while all of this processing is happening helps inform the user that the application is indeed working. Technically speaking, a splash screen is a Windows form that does not allow any input from the user. It usually has a nice presentation form with some artwork, the application name, its version, and often some legal text. One of the first features you ll add to your Web browser application is a splash screen.

Ad hoc mode Ad hoc mode allows wireless client computers to connect directly without the use of an access point. For example, a collection of clients in a conference room can use ad hoc mode to create a network, as shown in the following illustration. However, if you want to access a wired LAN, you ll need some sort of bridge, such as a wireless access point or a Windows XP computer acting as a network bridge. Otherwise, the wireless network clients can only communicate with each other.

Part III:

Default members of the local Administrators group include the first account created on a clean installation, existing members of the local Administrators group in an upgrade, and members of the Domain Administrators group in a domain environment. Administrators can create or delete user accounts and modify permissions for users and resources. Administrative access to the system is ideally used only to: