Try it
A desktop in your browser.
Drag the windows by their title bars. Open and close apps from the dock. Notes are kept in this browser only. This is a sketch of the real desktop, drawn with web tech, not the HolyC one.
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Kosmos Temple Desktop
The real one is HolyC on TempleOS: 640x480, 16 colours, ring 0. This page is its portrait.
Boot it and look around.
Build the image, run it in QEMU, and the desktop is there in a few seconds.