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
Keyboard layout of that script. An InScript keyboard is inbuilt in most modern operating systems including Windows, Linux, and Mac OS. It is also available in some mobile phones. Khmer uses its own layout roughly matched to the equivalent of its QWERTY counterpart. For example, the letter ល is typed on the same space as the letter L on the English-based qwerty. Since most Khmer consonants have two forms, the shift key is used to switch between the first and second forms. The glyph below the letter ញ is used to type in subscripts when they occur in a cluster. Since spaces