The monitor is a unit of information (Input) and display the data (Output), which will display all the letters and pictures will come from the receiver circuit Video Graphic Array (VGA Card)
The unit monitors the data received (Input) and unit data (Output), which will display both text and images. It receives signals from the circuit Video Graphic Array (VGA Card).
The monitor will be the receiving unit (Input) and the display unit information (Output), which shows both letters and pictures will receive a signal from the circuit board. Video Graphic Array (VGA Card).