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Install the operating system and components (including drivers for hardware, system services, and so forth). Install service packs and software updates. Install Windows updates. Upgrade the operating system. Repair the operating system. Configure critical computer-wide operating system parameters. Take ownership of objects.

Using Both Infrastructure Mode and Ad Hoc Mode Windows XP can operate in both wireless modes. Perhaps you use a wireless laptop at work in an office that uses infrastructure mode. Your laptop uses the office network during the day through a wireless access point. However, at night, you might bring your laptop home and want to connect your laptop to your home network for Internet access by connecting to a wireless-equipped desktop computer. Windows includes a service called Wireless Zero Configuration, which initiates a sequential process for determining the appropriate wireless network mode to use. Windows XP first searches for a wireless access point. If one is found, Windows XP switches the wireless adapter to infrastructure mode. If no access point is available, Windows XP looks for other computers operating in ad hoc mode. This process lets you move from infrastructure to ad hoc mode as needed without making any changes to the configuration of the wireless adapter. This feature requires that the software drivers for the wireless adapters support the Wireless Zero Configuration service.

In some cases, administrative accounts must also be used to install and run legacy Windowsbased applications. Tip

Limit the membership of the Administrators group. The greater the number of members in the Administrators group, the greater the number of accounts that a hacker or virus can potentially use to gain access to a computer.

Backup Operators Members of this group can back up and restore files on the computer, regardless of the permissions that protect those files. They can also log on to the computer and shut it down, but they cannot change security settings. Guests By default, members of the Guests group are denied access to the application and system event logs. Otherwise, members of the Guests group have the same access rights as members of the Users group. This allows occasional or one-time users to log on to a workstation s built-in Guest account and be granted limited abilities. Members of the Guests group can also shut down the system. Note The Guest account, which is a member of the Guests group by default, is not an authenticated user. When logged on interactively, the Guest account is a member of both the Guests group and the Users group. However, when logged on over the network, the Guest account is not a member of the Users group.

To create a wireless network, you need wireless NICs for the computers that will participate on the wireless network as well as a wireless access point if you plan on configuring your wireless network to use infrastructure mode.

HelpServicesGroup Members of this group can use helper applications to diagnose system problems. This group, in conjunction with the Support and HelpAssistant accounts, can be used by members of Microsoft Help and Support Center to access the computer from the network and to log on locally.

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computers. PCI adapters are also available and allow you to plug a PC Card wireless NIC into a desktop computer. Some laptops also include built-in wireless NICs. Each wireless NIC has a miniature antenna for transmitting and receiving wireless data. Major networking companies like NetGear, Linksys, and SMC produce wireless networking devices in addition to their more traditional wired networking devices. Wireless NICs typically range in cost from $60 to $100; thus, they re a little more expensive than Ethernet NICs, but the price difference should not deter you from building a wireless network. Make sure that any wireless NIC you buy is compatible with the standard you intend to use, either 802.11b or 802.11a.