Ahh, but has anyone been dumb enough to use it on production systems yet :-)
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In fact many unix systems are actually 32bit with 64bit libraries unless you explicitly install the 64bit kernels (just take a look at 64bit AIX). The 64bit kernels often cause major headaches, so most run with 32bit kernels and just run 64bit apps on the system. Not really a true 64bit OS.
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Yes it does tend to be easier to use 32_bit kernels, however the 64_bit is there and ready to use if you want it and has been for a while. Still the greatest problem I've ever faced is explaining to people that 'Yes the computers clock is only running at 400Mhz, but that its a 64_bit sparc.
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XP 64bit and 2003 Server 64bit use 64bit kernels/subsystem and the Win64 API from the ground up AFAIK. 32bit apps run with WOW32 which is a subsystem to run 32bit (Win32) under 64bit (a bit like the old WOW used to run 16bit on 32bit NT, but nothing like Win9x which was 16bit DOS hacked to run 32bit on top of it and Windows on top of that ).
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Well its nice to know that you windows boys are finally catching up at last; but I think I'll stick to a system that I own rather than MS
Regards,
Ben