Every Mac with a Mini Display Port allows you to connect an external display or projector using an adapter. You can use an external display as your main work-space or to extend your desktop, or you can work in mirrored mode with a projector so you can view what your audience sees.
Use the Mini Display Port to DVI Adapter to connect an advanced digital monitor, such as the 20- or 23-inch Apple Cinema Display, that includes a DVI connector. Review the documentation or check with the manufacturer of your monitor to make sure you're choosing the right adapter.
