Somehow I got a window which I can't close. It's unclickable, floats above other windows and I don't know which process it belongs to.
Using Process Explorer's crosshair tool does not help, because it identifies the window which is at that monent behind this window. So if a browser is behind it, then crosshair returns the browser process, if the desktop then the desktop, etc.
Is there an other way than process explorer to identify it?
See the screenshot. It's the transparent window with the question mark.