On the 920xt you can download a widget that makes the screen look like a computer off the Starship Enterprise ..... what other reason do you need????
YOU MUST TELL ME HOW?
Open Garmin Express, click on the 920xt icon and on the next page there a tab in the middle that says 'Manage Apps'. Click on 'Get More Apps' that and it takes you to the Connect IQ Store and you just download them ..... simples