Do you ever find yourself with multiple Finder windows open? I accidentally opened up 80 windows all at once the other day (don't ask -- I have no clue how it happened!). It's not very efficient to close 80 windows one by one. Luckily, I knew this quick shortcut to close all of the open Finder windows at the same time. Here is how to do it: On the keyboard, press Command-Option-W (no '-' keys) and it will close ALL of the open Finder Windows.