Quote:
Originally posted by BenH
There is no 64_bit version of XP, just some extended libs that allow it to be run on an Itanium or Opteron processor. Currently the only real 64_bit OS is any one of the unicies, including Linux.
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Other than...
Windows Server 2003 Enterprise 64bit edition (note that it replaces the old 'limited' edition which might be the library version you mention, see
here)
Windows XP 2003 64bit edition
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.
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 ).