Web Reference: In computing, a Control key Ctrl is a modifier key which, when pressed in conjunction with another key, performs a special operation (for example, Ctrl + C). Similarly to the Shift key, the Control key rarely performs any function when pressed by itself. The story of Ctrl+Z, Ctrl+X, Ctrl+C, and Ctrl+V shortcuts for Undo, Cut, Copy, and Paste in Windows goes back to the very early 1980s. The earliest ancestor of these shortcuts appeared on the Apple Lisa computer in 1983. The Lisa was a precursor of the Macintosh and Apple's first mouse-based computer. Many shortcuts (such as Ctrl + Z, Alt + E, etc.) are just common conventions and are not handled by the operating system. Whether such commands are implemented (or not) depends on how an actual application program (such as an editor) is written and the frameworks used.
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