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CUA stands for Common User Access, one of IBM's
Systems Application Architecture (SAA) architectures.
CUA is the one that deals with guidelines for consistency
in interface design (or communication between a user
and the terminal or workstation). I don't know whether
anyone besides IBM puts out manuals on how to apply
CUA guidelines, but I suppose you could always order
one directly from them (I may be able to scrounge up
a telephone number if you're interested).