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river Framework Acorn User User error Lazy user model User-defined function Apple User Group Connection User intent User activity monitoring Z User Group Attentive user interface Unique user User environment management Atari ST User Persona (user experience) Principles of user interface design Windows USER Console user interface First-time user experience Multi-user MIMO Linux User and Developer Multi-user dungeon History of the graphical user interface Natural-language user interface Web User Concurrent user Lead user Average revenue per user Reference and User Services Quarterly End-user computing MPEG user data Q