Unit 4 Computer Input Devices – We reviewed the types and use of computer input devices. We reviewed the use of special keyboard keys on a computer keyboard such as print screen, Caps Lock, and Num Lock. Then we reviewed the types of computer input devices and the type of application for which they are used. Next, we learned the type of keyboard shortcuts to save documents, refresh the screen, and cut-and-paste within a document. On a keyboard we identified the location and use of the navigational, alphanumeric, and function keys.