... S (save) Ctrl + V (paste) Ctrl + X (cut) and Ctrl + Z (undo) etc. Other extra keys include functions such as displaying help information. Their exact purposes are under the control of the software in use. Although the standard keyboard is very useful for a wide range of applications there are some tasks for which it is not suitable. Examples of where different keyboards are used are fast-food restaurants, they use an overlay keyboard. Some keyboards are usually connected up with a till which act as computer terminals, each key on the keyboard represents one of the items of food. There are also numbers keys so the operator can enter the price and quantity of the item. The keyboard is flat and waterproof. An ordinary keyboard would be difficult to keep clean and a split drink can cause serious damage, this is why places like McDonalds and Burger King ...

See this essay or coursework document in full right now