Apple Mini-DVI video output port
Using the Apple Mini-DVI video output port, you can mirror video or extend the size of the Mac OS X desktop (extended desktop mode) with a compatible DVI (Digital Visual Interface) display or VGA (Video Graphics Display) or projector using the appropriate Apple Mini-DVI adapter:
For DVI displays, use the Apple Mini-DVI to DVI Adapter (M9321G/A).
For VGA displays or projectors use the Apple Mini-DVI to VGA Display Adapter (M9320G/A).
For televisions, projectors or VCRs that use S-video or composite video connectors, use the Apple Mini-DVI to Video Adapter (M9319G/A).