Yes you can.
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Advantages* Much faster for making non-text selections such as menu choices on the till of a fast-food outlet. * The keyboard is waterproof which can be useful where there is dirt or the risk of splashes. Disadvantages* Poor for text or numeric input - although some keyboards do include a numeric keypad so the operator can enter the amount sold. * Limited to the options shown on the keyboard.
you write it as CMLXXl in roman numerals
The Formula Bar.
PIN #
function keys