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