Possible Clues:

• "Abort!" key
• PC bailout button
• If you're on a laptop, letters likely above your left pinkie. Go on, look!
• Key that might close a window
• Get-out-of-full-screen button
• Key used to leave
• Exit-a-program button
• PC ''flee'' key
• Key that closes windows
• Upper-left computer key: Abbr