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r Acorn User Apple User Group Connection User interface modeling User-subjective approach Attentive user interface User-Mode Driver Framework Z User Group User activity monitoring User-defined function User environment management Persona (user experience) Atari ST User Console user interface Principles of user interface design Windows USER Unique user Multi-user MIMO Natural-language user interface Multi-user dungeon History of the graphical user interface Linux User and Developer Lead user First-time user experience Web User Average revenue per user Concurrent user Reference and User Services Quarterly End-user computing List of g