By knowing that they want to do.
What you need the computer for will determine what input devices you require.
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Input from the user to the computer can come through many peripheral devices such as the keyboard, mouse, touch-screen, a modem or a web camera.
There are no inherent disadvantages in having or using an input device. As a matter of fact, there simply aren't any alternatives, so it would be largely irrelevant, anyway.
Input and output devices are hardware components that allow a computer to receive and process data, and provide the results of this processing to the user. Some examples of input and output devices available today include: Input devices: Keyboard, mouse, touchpad, touch screen, microphone, scanner, game controller Output devices: Monitor, printer, speakers, headphones, projector, touch screen These devices are available in a range of sizes, designs, and features to meet the needs of different users and applications. Some devices may be specialized for specific tasks, such as gaming or graphic design, while others may be more versatile and suitable for general use.
An input device is any peripheral used to provide data and control signals to an information processing system ... examples - mouse, keyboard An output device is any peripheral used to communicate the results of data processing carried out by an information processing system ... examples - printer, monitor, speaker
do you mean like the optimus maximus, where they charge a rediculous amount of money to make something look "cool" or are you refering to suff like multi-touch sensitive displays, the keyboard in a glove, the frogpad one handed keyboard, or computers that can read our minds?