Learn about pairing an Apple Wireless Keyboard with a passkey.
If you pair your Apple Wireless Keyboard in Bluetooth preferences rather than in the Bluetooth Setup Assistant, you will be asked to create a passkey.
Choose any combination of numbers, but do not use letters in your passkey.
For more information on pairing your Apple Wireless Keyboard, see technical document 86467, "Bluetooth: How to Set Up Your Apple Wireless Keyboard".