> Is it possible to take a chunk of the frame buffer and turn it into a 
> texture?

You can, but it's a bit long-winded and slow.

> Or would I have to render texture to texture and then make a copy to the 
> screen so I can see it?

Yes, that's what is normally done.  Also gives you the advantage that you 
can do funky things with the pixel shader you use to write the texture to 
the screen, like using colour look up tables, motion blur, bloom, edge 
detection, etc etc.

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