Substitute character actions than the last one can also be undone by pressing multiple times. was one of a handful of keyboard sequences chosen by the program designers at Xerox PARC to control text editing. Presumably these particular keystrokes were chosen because of their location on a standard QWERTY keyboard, since the Z (undo), X (cut), C (copy), and V (paste) keys are located together at the left end of the bottom row of the standard QWERTY keyboard. Substitute character A substitute character (␚) is a control character that is used in the place of a character that is recognized to be
Text entry interface to communicate and record information and data. A "computer keyboard" is a series of electronic switches used to input data into a computer. Each button typically represents one character, but some symbols may only be accessible via a combination of buttons. The layout of the keyboard is like that of a traditional typewriter, although there are some additional keys provided for performing further functions. There are a number of different keyboard layouts available, QwERTY being the standard English-language keyboard layout. The standard English keyboard map is referred to as QWERTY, as the first six keys on the top row of