I was just reading »How to revert to GNOME Classic?«. Some answers say that you should press Alt+Win to get the Add to panel dialogue. However my keyboard has no Win. So I was asking myself how to start the Add to panel window. Usually the best way is to enter the program name into a terminal. In this case I can't figure out the name.
I tested it on another computer and couldn't find the name in the process list. Also
xwininfo or similar programs shoed no name. So what is the best way to figure out the name of the program which opened a (X) window.