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
Portuguese keyboard layout are specified in the ABNT NBR ("Norma Brasileira Regulamentadora") 10346 variant 2 (alphanumeric) and NBR 10347 (numeric portion) standards. Portuguese keyboard layout There are two QWERTY-based keyboard layouts used for the Portuguese language. Additionally, there are two variants of the Dvorak Simplified Keyboard designed for Brazilian Portuguese. Typewriters in Portuguese-speaking countries generally have a separate extra key for "Ç", and a dead key for each diacritic except the cedilla; so that "Á" is obtained by typing first the acute accent, then the letter "A". The same thing happens with computer keyboards, except when using an "English – International" keyboard layout,