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Common User Access (CUA) is a set of guidelines for the user interface to personal computer operating systems and computer programs, developed by IBM in 1987 as part of their Systems Application Architecture. Used originally in the OS/2 and Microsoft Windows operating systems, parts of the CUA standard are now implemented in programs for other operating systems, including Mac OS X and Unix.
The CUA contains standards for the operation of dialog boxes, menus and keyboard shortcuts that have become so influential that they are implemented today by many programmers who have never read the CUA.