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System calls, Processes , threads , interprocess communication , concurrency and synchronization. An Operating System (OS) acts as an interface connecting a computer user with the hardware of the computer. Memory management and virtual memory. Description. There are three common ways of establishing relationship between user threads and kernel threads Many-to-many model One-to-one model Many-to-one model GATE Computer Science Engineering ( CSE) 2009 Paper Analysis. Operating System GATE Study Materials Book Notes for Upcoming GATE Exam, The Notes which are Provided by us are the best notes, After Preparing From these Class Toppers Notes, You can Definitely achieve your goal. Just take a look.". Operating System Process States in Operating System- Each process goes through different states in its life cycle- 1. An operating system is a program that acts as an interface between the user and the computer hardware and controls the execution of all kinds of programs. 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