When you have lots of applications open on your Mac all at once, it can become confusing maneuvering around them all. Sure we have Expose', and other cool tricks, but here is one I use often. Note: This only works if you have multiple apps open on the desktop at the same time. Hold down Command+Option at the same time and click on the dock icon of the application you want to focus on. Now all of the other windows will be hidden, until you click on them to restore them. Bonus: On the Dock, Click and hold down the mouse button of the app you want to focus on, a menu will pop up, and then press the 'Option' key, you can select 'Hide Others'.