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for user innovation Lazy user model User-Mode Driver Framework Journal of Organizational and End User Computing Acorn User Apple User Group Connection User intent Object-oriented user interface User error Z User Group User-subjective approach Atari ST User User interface modeling User-defined function Unique user Attentive user interface Principles of user interface design User environment management Windows USER Persona (user experience) Console user interface User activity monitoring First-time user experience Linux User and Developer Multi-user dungeon Web User Multi-user MIMO History of the graphical user interface Lead user Natural-language user interface Concurrent user Average revenue per user Reference and User Services Quarterly En