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User-subjective approach User activity monitoring User-defined function Z User Group User environment management Persona (user experience) Unique user Console user interface Atari ST User Principles of user interface design Multi-user MIMO Windows USER Natural-language user interface History of the graphical user interface Multi-user dungeon First-time user experience Linux User and Developer Web User Concurrent user Lead user Average revenue per user End-user computing Reference and User Services Quarterly List of graphical user interface elements Vector-based graphical user interface Browser user interface MPEG user dat