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The Micro User Sinclair User Single-user mode User fee User Friendly User assistance Text-based user interface User interface management system Intelligent user interface User interface markup language Fast user switching User space and kernel space User requirements document Amstrad Computer User IBM Common User Access User information End-user license agreement Closed user group Natural user interface Adaptive user interface Active users User Account Control User–network interface User model Lazy user model Toolkits for user innovation Object-oriented u

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