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 "Reason" magazine where they rejected Dvorak proponents' claims that the dominance of the QWERTY is due to market failure brought on by QWERTY's early adoption, writing, "[T]he evidence in the standard history of Qwerty versus Dvorak is flawed and incomplete. [..] The most dramatic claims are traceable to Dvorak himself; and the best-documented experiments, as well as recent ergonomic studies, suggest little or no advantage for the Dvorak keyboard." In certain forms of writing, typing speed is limited by other factors than keyboard layout. For example, the words per minute (WPM) of authors and writers has not seen a noticeable