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
MessagEase an 'o'. Sliding to the left from the same square generates a 'c'. A green trail shows the path of the finger. The keyboard supports multiple user dictionaries, used for word prediction and correction. The software is developed and patented by ExIdeas, based in Belmont, California. It was first released in 2002 for the Palm, along with a paper in 2003. The keyboard layout has a 3x3 matrix that allows for full-text entry. The letter placement is optimized for minimal movement distance between letters, allowing for faster typing. The layout is 67% faster than a standard QWERTY software keyboard, and