Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Many computer user interfaces use a control panel metaphor to give the user control of software and hardware features.The term control panel was used for the plugboards in unit record equipment and early computers. Although debatable, the metaphor's popularity is attributed not to the Xerox Star or the Apple Lisa which pioneered the first graphical user interface metaphors. The operation of these machines did in fact appropriate windowed methods of controlled user settings by single click selections and variable fields. In 1984 the Apple Macintosh in its initial release made use of fundamental graphic representation of a "control panel board" imitating the operation of slider controls, on/off buttons and radio-select buttons that corresponded to user settings.

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