Connect the adapter to the Mini-DVI port of the computer and the VGA end of the adapter to an external VGA monitor or projector.
Genuine Apple Mini DVI to DVI Adapter from Apple
Genuine Apple Mini-DVI to DVI Adapter cable 922-6227 M9321G/B
Genuine Apple Mini-DVI To Video Adapter - S-Video/Composite - M9319G/A
Genuine Original Apple Mini-DVI to DVI Adapter Cable
Genuine Apple Mini DisplayPort to DVI Adapter (A1305/MB570Z/B) - MacBook - iMac
Genuine Apple Mini Display Port to DVI Adaptor A1305 MB570Z/B MacBook Pro/Air