I believe that's how the MGR window system, from Bellcore, worked. I fiddled around with it briefly on an old Sun Workstation many years back. https://en.wikip

I believe that's how the MGR window system, from Bellcore, worked. I fiddled around with it briefly on an old Sun Workstation many years back. https://en.wikipedia.org/wiki/ManaGeR https://en.wikipedia.org/wiki/ManaGeR