[antihero]

I don't think so - I find this very subjective - I've always assumed that X just closes the window, even if it's a single window app. This is consistent, just some applications happen to also run in the background.

[coldtea]

>I've always assumed that X just closes the window

That was one of the old differences between Windows and OS X behavior (or app-centric vs window-centric).

If you're reffering to Windows, then X usually closed the app too.

[coldpie]

> If you're reffering to Windows, then X usually closed the app too.

I think his point is the X closes the window, and many, but not all, Windows applications also choose to quit when their (last) window is closed.