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