Currently Being ModeratedFeb 8, 2013 10:16 AM (in response to cneil)
Application is in FullScreen mode.
When an Application is in FullScreen mode Menu bar, Toolbar and Dock will be hidden.
Move the cursor to the top and click the blue double arrow icon to get back to the normal window mode
or press esc key at the top left corner of the keyboard.
Clicking the grey double arrow icon at the top right corner of the window will make window Fullscreen.