[XeTeX] What is the best way to simulate small caps?

[Andy Black]

On 2/8/2009 9:46 PM, Will Robertson wrote:
> On 2009-02-08 10:01:43 +1030, Andy Black 
> <andy_black at sil.org> said:
>
>   
>> When a font family does not have a true small caps font, what is the
>> best way to simulate small caps?
>>
>> Would something like this be OK or is there a better way?
>>     \fontspec[Scale=0.65]{Times New Roman}{\MakeUppercase{prog}}
>>     
>
> You might want to add some letter spacing, and even perhaps the tiniest 
> amount of fake bold, but otherwise yes, this is pretty good. 

Thanks, Will, that is helpful.

How do I add some letter spacing or add a bit of bold (I did notice that 
the width of characters was less this way)?  Is there some place where 
this kind of adjustments are documented?

--Andy