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The previous client version of Windows. XP was a major upgrade to the client version of Windows 2000 with numerous changes to the user interface. XP improved support for gaming, digital photography, instant messaging, wireless networking and sharing connections to the Internet. It also added a personal firewall (see Windows Firewall). Although XP is a client operating system, it can also function as a server (see peer-to-peer network).

Home Vs. Pro
XP Home Edition was designed for the consumer, and XP Professional was aimed at the office worker with added security and administrative options. For example, XP Pro can log in to a domain-based network in an office, but XP Home cannot. XP Pro can also be run remotely, and it supports Intel's Hyper-Threading (see Remote Desktop and HyperThreading).

64-Bit XP
A 64-bit version of XP is also available for Intel IA-64 machines as well as AMD's 64-bit CPUs. Originally code named Whistler, the Windows XP operating system is .NET enabled. See .NET, Windows Product Activation, Windows Vista and Blackcomb.