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r-mode Linux Sinclair User Single-user mode User fee User requirements document The Micro User Intelligent user interface User space and kernel space User assistance Text-based user interface User interface management system User Friendly User interface markup language User information Fast user switching Amstrad Computer User IBM Common User Access Active users Closed user group End-user license agreement Natural user interface User model Adaptive user interface User–network interface Apple User Gr

oup Connection User intent User-subjective approach User error Acorn User Toolkits for user innovation Journal of Organizational and End User Computing User-Mode Driver Framework Lazy user model User Account Control Object-oriented user interface User-defined function Z User Group Attentive user interface User interface modeling Atari ST User Unique user Console user interface Principles of user interface design User activity monitoring User environment management Persona (user experience) History of the graphical user interface Multi-user dungeon Multi-user MIMO First-time user experience Windows USER Natural-language user interface Linux User and Develop