OS X Mountain Lion: Enter modifiers easily using Sticky Keys
Using Sticky Keys, you can enter key combinations—such as Command (⌘)-Q (for Quit) and Command (⌘)-Option (⌥)-Control (^)-8 (to reverse the display to white on black)—by pressing them in sequence instead of simultaneously.
When Sticky Keys is active, each modifier key you press is displayed in white in a corner of the screen, accompanied by a sound effect, so you can verify the sequence and correct it (if needed) before it’s entered. When you press the last key in the sequence, OS X plays a sound, enters the key combination, and removes the display from the screen.
Use Sticky Keys in combination with Keyboard Viewer to create an onscreen keyboard that you can type on using a mouse, trackball, or other similar input device.
- Choose Apple menu > System Preferences, click Accessibility, and then click Keyboard.
- Select Enable Sticky Keys.
To choose the corner where the symbols appear, and select other Sticky Keys settings, click Options.
You can also turn on Sticky Keys by pressing Command (⌘)-Option (⌥)-F5 and selecting Enable Sticky Keys.