How to turn on support for assistive devices

If you want to switch to the speakers connected to your AirPort Express® base stations or if you want to connect to shared libraries via Remote Buddy, you need to have support for assistive devices turned on.

Here's how:

1. Open /Applications/System Preferences.app
2. Click on the "Universal Access" icon (filled, blue circle with stylized human in the middle)
3. Make sure the checkbox "Enable access for assistive devices" is checked. You find it at the bottom of the Univeral Access pane.