Common User Access (CUA)
Common User Access aimed at providing "a common user interface for the entire IBM product line. A user who sits down at a PC should see the same menus, keyboards and procedures that he would at a 3270 terminal."
Because of hardware differences complete commonality was impossible to attain. IBM created two CUA standards, the Basic Interface for IBM 3270 and IBM 5250 terminals, and the Advanced Interface for so-called "intelligent workstations", or PCs. The keyboard was standardized to the "AT Enhanced" keyboard layout .
Read more about this topic: IBM Systems Application Architecture
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