The Apple DVI to Video Adapter was designed to allow Macs with a DVI port, such as the Power Mac G5, Mac mini, Mac Pro or MacBook Pro to connect the computer through the DVI port to S-Video or Composite video devices such as TVs, VCRs, or overhead projectors with S-Video or RCA (Composite) connectors.
For computers that already have a display, such as the MacBook Pro, the Apple DVI to Video Adapter allows you to extend your desktop or do video mirroring.
Video mirroring allows you to view the image displayed on the current display on the new monitor,television or projector.
Extended desktop mode allows you to use the screen area on an external display in addition to the display you're already using.
Connecting an external display is designed to be "plug and play".Simply turn on your external display or projector, and connect theappropriate adapter to the display (see above). Then connect theadapter to the DVI port located on the back of the computer.
Tip: To make sure that your computer automatically detects theexternal display or projector, be sure you plug the adapter into the external display or projector before you plug it into the computer.
You can switch between mirroring and extended desktop mode by opening System Preferences and clicking 'Displays'. Click the Arrangement button to set your primary display. To switch quickly between mirroring and extended desktop mode, press the F7 key.