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A shared wireless LAN (WLAN) standard using the carrier sense multiple access media access control protocol with collision avoidance. The standard allows for both direct sequence and frequency-hopping spread spectrum transmissions at the physical layer. A wireless LAN (WLAN) technology that operates at a data transmission rate as high as 54 Mbps and uses radio frequencies in the 5 gigahertz (GHz) range.

802.11a

object s discretionary access control list (DACL) that grants permissions to a user or group. An ACE is also an entry in an object s system access control list (SACL) that specifies the security events to be audited for a user or group. See also access control list (ACL); access mask; discretionary access control list (DACL); object; permission; security descriptor; system access control list (SACL).

throughout this book where applicable. However, when your Windows XP Professional stand-alone computer joins an Active Directory domain, any conflicting local policies are superseded by any site, domain, or OU policies. In other words, local Group Policy is the weakest form of Group Policy when your computer resides in a domain environment, but it becomes active again whenever the computer is disconnected from the domain and operates as a stand-alone computer.

access control list (ACL)

A list of security protections that apply to an entire object, a set of the object s properties, or an individual property of an object. There are two types of access control lists: discretionary and system. See also access control entry (ACE); discretionary access control list (DACL); object; security descriptor; system access control list (SACL). A 32-bit value that specifies the rights that are allowed or denied in an access control entry (ACE) of an access control list (ACL). An access mask is also used to request access rights when an object is opened. See also access control entry (ACE). A central piece of hardware on a wireless network that all computers on the network communicate through.

x86-based computer starts up. The active partition must be a primary partition on a basic disk. If you use Windows exclusively, the active partition can be the same as the system volume. See also basic disk; primary partition; system partition; system volume.

Protection in a Domain Environment Windows XP s support of Internet Connection Firewall (ICF) and the security features included in Internet Explorer 6 are designed for home networks and small offices. However, what about security in a domain-based network In domain environments, servers handle the connections to the Internet as well as e-mail. Typically, devices such as proxy servers are used to function as the proxy or agent between internal network clients and the Internet. The proxy server s job is to retrieve information from the Internet on behalf of network clients, so as not to expose those network clients to the Internet directly. In this case, some of the local security features available in Windows XP are not needed because the proxy servers provide the necessary security. In fact, if you enable one of those features, such as ICF, in a domain environment, you might lose connectivity. You can learn more about proxy servers, firewalls, and ICF in 5, Internet Connection Firewall.

computer starts up. The active volume must be a simple volume on a dynamic disk. You cannot mark an existing dynamic volume as the active volume, but you can upgrade a basic disk containing the active partition to a dynamic disk. After the disk is upgraded to dynamic, the partition becomes a simple volume that is active. See also active partition; basic disk; dynamic disk; dynamic volume; simple volume.

ActiveX A set of technologies that allows soft-

the security identifier (SID) for a security principal, SIDs for the groups that the security principal belongs to, and a list of the security principal s privileges (also called user rights) on the local computer. See also security ID (SID); security principal.

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6. Go to your Main.cs form in design mode, select cmsNotify in the component tray, and double-click the About... menu choice in the context menu strip. Add the following code to the tsmiAbout_Click event hander:

accessibility The quality of a system incorpo-

ware components to interact with one another in a networked environment, regardless of the language in which the components were created.