Sometimes there's a leftover window in the bottom right area of the screen. It's transparent (invisible), but it will not let me click windows underneath it. I know it's there, after I verified with xwininfo (I can get the id of this window).
So my question is: how can I destroy this window (so that I won't have to restart/logout to get rid of it)?
More details: there was a command to get the owner process of a window but I can't remember it right now. However, I did try it, and couldn't retrieve a process. Likely, the window is orphaned. So I just need an X specific way to destroy the window as the owner process likely no longer exists.