Problem after problem was traced back to the use of global variables. Over time I'd eliminated a lot of them, but there's a lot left. It's hard to change how a function works if there's a back channel of globals passing state around. Globals break encapsulation, making code difficult to understand.

Sounds like it's time to refactor some code there Walt.

Assuming that "multiple in-memory screens" would be covered by this patent, Amiga 1000 did in fact have this in 1985. I did some checking to be sure, and it appears that not only were multiple workspaces supported, but each workspace could even have a different resolution and color depth. It also appears to have supported dragging items from one workspace to another.

"inexplicable"... You keep using that word. I do not think it means what you think it means.