In a meeting I want to share only a single application window instead of the whole screen. Doing so, the shared window is covered by something else in the upper left of my screen (the TeamViewer main window and the meeting panel are somewhere else). How can I find out what is covering the shared application window?
I guess that one good try would be to hold down the Alt key and press continuously the Tab key. This will circulate between all opened apps. Windows brings to the front the app you choose each time by this key combination and after you releasing both keys in the corresponding circulation pane on the screen you can see which app causing that.
Try that on each of the running apps and you will find that are you looking for in a few seconds.