Oldsmobile 1999 Aurora - Manual (Page 61)

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The ignition key is for the
ignition only.
The door key is for the
doors and all other locks.
When a new vehicle is delivered, the dealer removes the
plugs from the keys and gives them to the first owner.
The ignition key has a bar
- coded key tag.
Each tag has a code on it that tells your dealer or a
qualified locksmith how to make extra keys. Keep the
tags in a safe place. If you lose your keys, you’ll be able
to have new ones made easily using the tags. You can
also go to your dealer for the correct key code if you
need a new ignition key.
NOTICE:
Your vehicle has a number of features that
can help prevent theft. But you can have a lot
of trouble getting into your vehicle if you ever
lock your keys inside. You may even have to
damage your vehicle to get in. So be sure you
have extra keys.