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Windows XP brought to the consumer line of Windows many features previously available only in the server- and workstation-oriented Windows NT and Windows 2000 families, such as greater stability and efficiency due to its pure 32-bit kernel, instead of the hybrid 16-bit/32-bit kernel in prior consumer versions of Windows.
Windows XP is also the first consumer version of Windows to use product activation to combat software piracy, and this restriction did not sit well with some users and privacy advocates.
Windows XP was also vulnerable to the Sasser worm, spread by using a buffer overflow in a remote service present on every installation.
XP planning addresses two key questions in software development: predicting what will be accomplished by the due date, and determining what to do next.
XP avoids these problems through two key techniques: the programmer tests catch mistakes, and pair programming means that the best way to work on unfamiliar code is to pair with the expert.
XP teams follow a common coding standard, so that all the code in the system looks as if it was written by a single -- very competent -- individual.