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