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
USS Letter B (SP-732) October 1917 at Norfolk, Virginia, with Quartermaster First Class L. C. Chamberlain, USNRF, in command. Assigned to the 5th Naval District, "Letter B" served as a harbor and shore patrol boat at Norfolk and Hampton Roads, Virginia, for the rest of World War I . She also served as a duty and emergency boat for seaplanes at Naval Air Station Norfolk. The Navy returned "Letter B" to Eaton on 29 April 1919. USS Letter B (SP-732) USS "Letter B" (SP-732) was a United States Navy patrol vessel in commission from 1917 to 1919. "Letter B" was built in 1912 as