Control-C else, typically returning control to the user. Ctrl-C was one of a handful of keyboard sequences chosen by the program designers at Xerox PARC to control text editing, with Ctrl-Z (Undo), Ctrl-X (Cut), Ctrl-V (Paste), and Ctrl-P (Print). The first four letters are all located together at the left end of the bottom row of the standard QWERTY keyboard, and P towards the upper right. The equivalent key combination on Macintosh computers is Command-C. Control-C as an abort command was popularized by TOPS-20 and TOPS-10 and adopted by other systems including Unix. It was also adopted by Digital Equipment operating
Dvorak Simplified Keyboard up a drop-down menu, allowing the user to choose the desired layout. Subsequent keystrokes will reflect the choice, which can be reversed the same way. Mac OS X 10.5 "Leopard" and later offer a keyboard identifier program which asks users to press a few keys on their keyboards. Dvorak, QWERTY and many national variations of those designs are available. If multiple keyboards are connected to the same Mac computer, they can be configured to different patterns and use simultaneously. However should the computer shut down (lack of battery, etc.) the computer will revert to QWERTY for reboot, regardless of what