An Operating System is designed to work with a CPU - in the case of Longhorn
the 64 bit architecture has been well defined and even available ahead of the
sofware release.
WHat makes it all happen is the HAL - hardware abstraction layer
[essentially a series of programs or utilities that accomodate the
translation and management of Operating System requests and hardware specific
functions].
Longhorn is built around three major advances--a new graphics and
presentation engine known as Avalon, a new communications architecture known
as Indigo, and a new file system known as WinFS that borrows from Microsoft's
relational database technology.
Now where is the 'not available now stuff?
Miss Perspicacia Tick said:
As Longhorn is scheduled for release in just over a year, I think you'll
find that much of the hardware on which it will run has been designed - and
some may even have been manufactured.