No, that's not what Unity does. I'm not 100% sure (work computer right now), but I think it might work like this when you click on the icon for app X: If the ac

No, that's not what Unity does. I'm not 100% sure (work computer right now), but I think it might work like this when you click on the icon for app X: If the active window does not belong to X, make the most recently used window of X active. If the active window already belongs to X, bring all other windows to the front. In other words, if you're already working with an app, clicking the icon brings all other app windows to the front. If you're not working with the app, clicking once show the most likely useful window, clicking twice shows all others. It feels very natural for me. I specifically prefer it to the way Windows 7 does it with its window previews. Crucially, there is no dedicated interface for selecting which application window you want to use. By bringing all app windows to the front, I can just immediately use the window I was looking for (as long as I want to use the mouse).