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interface Sinclair User Single-user mode User assistance User Friendly Text-based user interface User information Fast user switching User requirements document User interface management system User interface markup language Intelligent user interface IBM Common User Access Amstrad Computer User User space and kernel space Object-oriented user interface Adaptive user interface Closed user group Natu

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