Over at The Mac Tipper Blog they have posted a great tip for using your keyboard to cycle through all of the open windows. The short cut is called “Move focus to the active window or next window” in the Keyboard Shortcuts area of the Keyboard & Mouse System Preference Pane. According to the post the default is “Control + F4” but, if you are like me and on a macbook and just hit the “Control +F4” all it does is change the volume (some newer Macbook keyboards are different). For the default to work for me I also have to hit the “FN” key and to hit all of those keys its not a comfortable key stroke. So I change it to an easier one.After I opened up the System Preference From the Apple Menu, I selected the “Keyboard & Mouse Pane” and clicked on the “Keyboard Shortcuts” tab on the Left. The “Move focus to the active window or next window” is about the 4th option down the “Keyboard Navigation” list. To change the Default just double click on the short cut ( area on the right). Once the area has changed to an editable area just use the keyboard short cut you want to make it. I really liked the one that The Mac Tipper had so I used it as well. It is “Control + Shift + .(period)”. You could use any one you want but make sure it is not one you may use for an application.