Xorg dual monitor clone single application window

Hi,

This is an odd question. I was wondering if anyone knew of a way to clone a desktop to a second monitor on an XrandR compatible dual monitor setup?

I don't want to clone two monitors completely. Just a single desktop. In a presentation I want to be able to have one desktop that is cloned between both monitors. On the spare monitor the shared desktop would be permanently visible. On the primary monitor I would be able to switch desktops without it showing on the spare monitor, but if I switch to the shared desktop, everything I do there is seen on the spare monitor.

Anyone ever tried this?
 
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