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
QWERTY or based on the English (US) keyboard. In Windows 8 and later versions, the backslash key (left of Z or space) is duplicated onto the hash key (left of Enter), press which with key to type backslash , with and keys to type vertical bar . This aids users who are familiar with UK keyboard layout while the keyboard lacks this key (e.g. US Standard keyboard and Japan JIS keyboard). The British version of the Apple Keyboard does not use the standard UK layout. Instead, some older versions have the US layout (see below) with a few differences: the sign