[racket] Capture and display thumbnail snapshot image of a frame

Hi all,

I would like to show in a canvas% (or perhaps as some type of snip%) in one
window, a thumbnail snapshot image of the current display (i.e. the
contents) of some other frame%.

My understanding of how the GUI all hangs together isn't clear, and so I am
unsure of the best way to attack. Any tips or bits of code that can get
started would be appreciated.

Cheers,

Kieron.
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