[nesyt]

So MacVim does have this functionality then, yes? You can have multiple top-level windows, each having multiple tabs, each having multiple splits.

[splawn]

I was curious so i just tested this to see if it did. It does not. Yes you can have multiple tabs and splits, but in emacs each frame shares the same buffer list as well.

[cityhall]

They don't share anything. Different buffers, registers, and I think even different extensions loaded.