Cycling through open windows!
I already mentioned how to cycle through open windows with "Command - ` " and through open applications with "Command - Tab". I didn't know at first that there was a more windows-like way of doing it that will let you cycle through all the open windows in every loaded application. It is based on the same idea than "Ctrl - F2" to go to the menu bar and "Ctrl - F3" to go to the dock. So to cycle through every open window, press "Ctrl - F4" (or "Fn - Ctrl - F4" if F4 is already assigned to something else). If it doesn't work, it might be because the Ctrl - F2, F3 and F4 features are not enabled. To enable them, press "Ctrl - F1". You can use the same "Ctrl - F1" to disable it.