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