Heads Up Display shows all your Widgets above any other applications you have running. The initial shortcut key for this feature is F8 in both Windows and Macintosh; click anywhere on the background to return to the normal desktop.

You can change the F8 shortcut key to any other key. To do this, click on the gear icon on the Yahoo! Widgets dock, then click on Preferences. In the menu that appears, you can change your shortcut key settings.