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In the IBM PC Bios typing an Alt code greater than 255 produced the same as that number modulo 256. [3] Some applications retained this behavior, while others (in particular applications using the Windows RichEdit control, such as WordPad and PSPad ) made numbers from 256 to 65,535 produce the corresponding Unicode character. [ 4 ]
A Control key (marked "Ctrl") on a Windows keyboard next to one style of a Windows key, followed in turn by an Alt key The rarely used ISO keyboard symbol for "Control". In computing, a Control keyCtrl is a modifier key which, when pressed in conjunction with another key, performs a special operation (for example, Ctrl+C).
entering system commands via a keyboard [a] entering commands for a subsystem, e.g., HASP, via a keyboard [a] replying to requests for information [b] taking actions such as mounting computer tapes that were "pulled" by a tape librarian; supervising a tape operator, especially when there is a non-specific mount request. [c]