 This is assisted by a visual representation of the keypad in the lower right corner of the screen, which also shows the function of each key at any given time.For example, during ship-to-ship combat, the "3", "7", and "1" keys on the numpad representation are shown with images of different cannonball types - these buttons are used to select different types of cannonballs to fire.The on-screen keypad can also be clicked with a mouse, performing the same function as the keyboard key would have performed.