[rbanffy]

Windows 1 used tiled windows (MS programmers didn't learn how to overlap windows until Windows 2) and Emacs has them since the 70's. I am not sure if tiling windows could be called innovation.

[username3]

The first version (Windows 1.0) featured a tiling window manager, partly because of litigation by Apple claiming ownership of the overlapping window desktop metaphor. http://en.wikipedia.org/wiki/Tiling_window_manager#History

[Symmetry]

There's a big difference between just having tiling windows and having all the features that make them more useful than a stacking windows manager.

But really we should be giving credit to Plan 9 here for pioneering the model of the modern tiling windows manager.

[rbanffy]

Plan 9 deserves a whole lot more credit than just that. It's really a shame we are still using Unix-like OSs and not Plan 9-like ones.