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This is very cool and definitely useful when you have a large screen at your disposal. I have a 27" screen which doesn't give you as much screen real-estate as yours. So what I'm using is a script which spawns a separate Xephyr window as DISPLAY 9, and puts a bunch of windows on that screen. https://gist.github.com/radupotop/d77a47767e2e65a7e7d40d1ea8... I use this as my demo environment.

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Neat trick. Another, similar one, is possible with "xrandr --setmonitor". That doesn't require starting a separate X server & WM instance:

https://askubuntu.com/q/150066#998435

However, both Xephyr/Xnest and "xrandr --setmonitor" create separate non-overlapping screen(s), which means sharing part of a window (say, browser sans chrome [1]) can't be done here, but is possible with OP's tool.

[1] EDIT: "chrome", as in - parts of browser's window other than webpage itself: tabs, URL bar, bookmarks, etc...

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