Linked by Thom Holwerda on Mon 22nd Oct 2007 13:48 UTC
Windows Earlier today, OSNews ran a story on a presentation held by Microsoft's Eric Traut, the man responsible for the 200 or so kernel and virtualisation engineers working at the company. Eric Traut is also the man who wrote the binary translation engine for in the earlier PowerPC versions of VirtualPC (interestingly, this engine is now used to run XBox 1 [x86] games on the XBox 360 [PowerPC]) - in other words, he knows what he is talking about when it comes to kernel engineering and virtualisation. His presentation was a very interesting thing to watch, and it offered a little bit more insight into Windows 7, the codename for the successor to Windows Vista, planned for 2010.
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RE: Honk! Honk!
by phoenix on Tue 23rd Oct 2007 04:31 UTC in reply to "Honk! Honk!"
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WOW64 is proof, shipped with any 64bit Windows, that it's entirely possible to run two different userlands (more like subsystems) on the same kernel. There's a full 32bit subsystem installed to run any 32bit application, and apart from messaging, the 32bit subsystems runs completely on its own, only sharing the kernel as common code.

WoW has been around since the earliest releases of Windows NT 3.51. There were several "personalities", as they were called, released with NT 3.51:
- Win16
- Win32
- OS/2
- Posix
- probably more, but that's all I can remember off the top of my head

The OS/2 personality was dropped with Windows 2000, the Posix subsystem was "replaced" with Services for Unix, and Win64 was added.

This is not a new concept, and was one of the main selling points of Windows NT back in the day.

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