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ntive user interface Z User Group User-Mode Driver Framework User-defined function Object-oriented user interface Atari ST User User interface modeling Persona (user experience) User environment management Unique user Console user interface User activity monitoring History of the graphical user interface Principles of user interface design Windows USER Multi-user MIMO Linux User and Developer First-time user experience Multi-user dungeon Natural-language user interface Lead user Web User Average revenue per user Concurrent user Reference and User Services Quarterly List of graphical user interface elements Vector-based graphical user interface MPEG us