McDonald’s POS system are pretty simple, they have in their database all products, numbers, sides, with all possible configurations. When you start asking, the gentleman or lady in the cashier start hitting the right spot for what you ask in a touchscreen lcd monitor, whenever they choose something with multiple choice, a sub list appears, for example, when they hit number one, they have to choose the drink you want, and it can be sprite, coke, guaraná, juice, whatever, pretty simple and easy. Some times I like to ask their top sunday with caramel and since it’s pretty big I…