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