Lion's Mission Control represents the evolution of three technologies introduced with earlier versions of Mac OS X: Spaces, Exposé and Dashboard. With Mac OS X Lion, Apple has merged the three into a single interface, called Mission Control. It offers an at-a-glance overview of the applications and documents you've got open as well as distinct virtual workspaces (which I'll call "desktops"). With Mission Control, you can keep applications separated while maintaining a bird's-eye view of what's going on. Here's what you need to know about Mission Control in Mac OS X Lion.