The CDU (control and display unit) is the human-machine interface of the FMS. It is basically a box with a numeric pad, a screen, a couple of selector keys, and annunciator lights. Each page on the screen has a specific title and you can scroll among the different pages of a given key by scrolling vertically or laterally.
The MCDU is usually confused with the FMC because this is what you can see in the cockpit, so you tend to think that this is the Flight Management Computer. However, the FMC is the ‘real computer’ and situated in the avionics bay, usually underneath the cockpit.
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