RTFM VMWare question

[John Whitfield]

 > The IBM VM is based on the use of the "Diagnose" 
 > instruction, which is ... an instruction 
 > operation code that actually generates an invalid 
 > instruction interrupt.  

 > I am not sure what an Intel based (style) 
 > processor does when it hits an 'invalid' 
 > instruction or how VMWare implements it.

I recall a hazy memory from Andrew Schulman's "Undocumented Windows 95" that MS used a similar technique for one of the Win95 features.  It stuck in my mind because MS copyrighted the technique which, as Schulman pointed out, was in use long before Windows.

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