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t Lazy user model Apple User Group Connection Z User Group Toolkits for user innovation Active users User interface modeling Acorn User Attentive user interface User-Mode Driver Framework Unique user User-subjective approach Atari ST User User activity monitoring User–network interface User-defined function Multi-user MIMO Journal of Organizational and End User Computing Console user interface User environment management Windows USER Natural-language user interface Persona (user experience) Principles of user interface design Lead user First-time user experience Concurrent user Web User Histor