Switch Between All Windows

I was browsing through the keyboard shortcuts that are predefined and found a cool keyboard shortcut. The one I'm referring to is "Move focus to the active window or next window" shortcut. This shortcut will cycle through every window you have. So, instead of using Cmd-Tab to switch between applications, then Cmd-` to switch between windows, you can use the shortcut you define to switch between all your windows. (I have mine set up to Cmd-Shift-`. The default is Ctrl-F4)