Mac Hot Corners are shortcuts for your mouse. Enable the Hot Corners feature, and you can throw your mouse cursor to the corner of the screen (the easiest place to hit) to perform quick actions. You can instantly lock the screen, start a screensaver, show the desktop, show all windows and more.
If you use your Mac with a standard two-button PC mouse instead of Apple’s Magic Trackpad or Magic Mouse, Hot Corners can replace the multitouch gestures that you miss out on. The Mac’s built-in Hot Corners feature provides a quick and easy way to navigate your computer, and I recommend that you turn them on and use them.

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