Following two situations require that you know how to set up a CD / DVD laptop when your laptop 'off':
Damaged causing you press the button repeatedly remain open.
You forget I want to produce a CD / DVD while the laptop is closed and you want fast.
Consider the CD / DVD of your laptop, there is no small hole there?
Note the CD / DVD players have tiny, tiny hole?
Take a needle or anything that will fit rods to be inserted in the hole. Press to place a CD / DVD open. Next you can take the CD / DVD that is in the normal range then close. Easy is not it? You can try it during an emergency. =)