"Invisible" <voi### [at] devnull> wrote in message 
news:48bd22a1$1@news.povray.org...
>>
> That still leaves open the question of how some products claim to 
> virtualise without emulation on CPUs that lack this technology.
>

Quote, from the wiki page you linked

"VMware and similar virtualization software for the x86 must employ binary 
translation techniques to trap and virtualize the execution of certain 
instructions. These techniques incur some performance overhead as compared 
to a VM running on a natively virtualizable architecture"
http://en.wikipedia.org/wiki/Binary_translation

Also see
http://en.wikipedia.org/wiki/Operating_system-level_virtualization

The hardware extensions is what makes the hypervisor type products (that run 
'beneath' the OS possible). You'll need that for things like Server 2008's 
hyper-V, VMWare's ESX server (which can make do without), Xen and others.

Things like VMWare workstation can use it but don't need it. MS's Virtual PC 
can't use the hardware emulation at all, though Virtual Server can

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