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
Dvorak Simplified Keyboard faster typing while also reducing repetitive strain injuries, although that claim is controversial. Although the Dvorak Simplified Keyboard (DSK) has failed to replace the standard QWERTY, most major modern operating systems (such as Windows, macOS, GNU/Linux, Android, Chrome OS, and BSD) allow a user to switch to the Dvorak layout. iOS does not provide a system-wide, touchscreen Dvorak keyboard, although third-party software is capable of adding the pattern to iOS, and the layout can be chosen for use with any hardware keyboard, regardless of printed layout. The Dvorak layout was designed to replace the QWERTY keyboard pattern (the "de facto"