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network interface Acorn User User Account Control Toolkits for user innovation Lazy user model User intent User-subjective approach Attentive user interface Object-oriented user interface Z User Group User-Mode Driver Framework User-defined function Atari ST User User interface modeling User environment management Persona (user experience) Unique user User activity monitoring Console user interface History of the graphical user interface Principles of user interface design Windows USER Multi-user MIMO First-time user experience Linux User and Developer Natural-language user interface Lead user Multi-user dungeon Web User Average revenue per user Concurrent user Reference and User Services Quarterly MP