[A-Z]UI: Evolution of User Interfaces From GUI Towards Ubiquitous Interfaces

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This paper gives an overview of evolution of different user interfaces: GUI (Graphical User Interface), WUI (Web User Interface), VUI (Voice User Interfaces), TUI (Tangible User Interfaces); and UUI (Ubiquitous User Interface); and illustrates how Computer-Human interaction gradually amend the concept of interaction from foreground activities into both foreground and background; invisible, but aware and ubiquitous.