The MULTIFUNCTION CONTROL DISPLAY UNIT (MCDU) of an Embraer 170-175 Airplane, a cockpit module with a screen that's black, white, and green, with a six-column wide horizontal alphabetical keyboard in the bottom-left, with a numeric keypad in the bottom right. Above the numeric keypad, there's a small wheel or joystick. Two rows of command buttons are under the screen. The screen has unlabeled buttons on either side of it, which line up with commands shown on the screen.