Windows XP 5in1:
Pro Retail, Pro VLK, Home Retail, Media Center, TabletPC - MSDN

Windows XP Tablet PC Edition is also a rich platform for developers who want to
create new applications or extend their current applications to use the pen and ink
capabilities of the Tablet PC. To encourage Tablet PC-compatible applications,
Microsoft offers a Tablet PC Platform Software Development Kit and the Microsoft
.NET Framework class library, a comprehensive, object-oriented collection of
reusable classes that can be used to develop applications for the Tablet PC.
Windows XP Tablet PC Edition is the first Windows operating system to be built
with the Microsoft .NET Framework.

Media Center Edition
Windows XP Media Center Edition puts all of your entertainment experiences?including
TV, music, digital video, photos, and DVDs?in one easy-to-access location. Navigate
through all of your entertainment options using the Media Center remote or a
keyboard and mouse. The Now Playing window keeps your current media selection in
view as you browse other entertainment options.

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