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Except for the Administrator and Guest accounts, local user accounts are not created automatically when Windows XP Professional is installed. Instead, local user accounts must be created by a member of the Administrators group after the installation is complete. In turn, only domain-level Administrators and Account Operators can create domain accounts. User accounts which include information such as the user s name, alias, password, and unique security identifier (SID) enable users to log on to the network or local computer and to access local and network resources. Any domain or local user can then manage permissions on resources on the local computer as long as the user has change permission rights on the resource. To create, delete, and manage user accounts, administrators can use User Accounts in Control Panel, the Local Users and Groups snap-in to the Microsoft Management Console (if the user account is local to a particular computer), or the Active Directory Users and Computers snapin (if the account is to participate in a domain). For more information about creating, deleting, and managing user accounts, see Local Users and Groups in Windows XP Professional Help and Support Center.

The good news, however, is that Windows XP is able to detect changes in the access point used and automatically reconfigure itself. Each time that a computer running Windows XP associates with a new wireless access point, it uses DHCP either to renew its current IP configuration (its lease) or to obtain a new lease that is valid for the new subnet. Additionally, Windows XP can even redetect proxy server settings for Microsoft Internet Explorer so that Internet connectivity is not disrupted when a move is made to a different access point. As a general rule, these automatic configuration tactics work well and are invisible to the user. Because an association with an access point has to be formed, that information can be passed from access point to access point as the user moves. This association passing is performed through Inter-Access Point Protocol (IAPP) so that an association only has to be made one time instead of each time the user moves from one access point to another. IAPP is supported by most access point vendors so that different access points from different manufacturers can be used, providing seamless operation.

User accounts are also members of security groups. Depending on the organizational environment, groups used to administer security can be defined by their scope, their purpose, their rights, or their role. The scope of a security group can be a single computer, a single domain, or multiple domains within a forest. In general, Windows 2000, Windows Server 2003, and Windows XP Professional groups fall into one of several categories. Computer local groups Computer local groups are security groups that are specific to a computer and are not recognized elsewhere in the domain. These groups are a primary means of managing rights and permissions to resources on a local computer. Domain local groups Domain local groups are local to the domain in which they are created, and thus can be given permissions and user rights only to objects on computers within the domain. Global groups Global groups, which are also created on domain controllers, are used for combining users who share a common access profile based on job function or business role. Global groups can contain user accounts from the same domain and other global groups from the same domain, and they can be granted permissions to any computer running Windows NT 4.0, Windows 2000, Windows Server 2003, or Windows XP Professional in any domain in a forest. Universal groups Universal groups are used in larger, multidomain organizations where there is a need to grant access to similar groups of accounts defined in multiple domains in a forest. Universal groups are used only in multiple domain trees or forests that have a global

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