It's simple to use. Click the EnumWindows button to list all the windows. Right click a window in the list and play around with it. If you have the Visible/Invisible box checked it will display the visible windows. If unchecked it will display all the invisible windows.
As a warning, in general it's a good idea to not mess with the invisible windows unless you're trying to unhide a window that you've hidden. If you're playing around and say maxmize a window you could end up having a fullscreen blank window that you have no way of minimizing and be force to reboot to fix it (believe me I know)



