Start & shut down a computer - The process of turning on computer that has been powered off completely, Provide User Interface - User types commands on the keyboard to give instructions, Manage Memory - this process is closely related to RAM, Manage Program - Modern multiprocessing operating systems allow many processes to be active,, Monitor Performance - The operating system manages hardware and software resources, Cold Boot - Switch on computer that has been powered off completely, warm boot - The process of using the operating system to restart a computer, Graphical User Interface (GUI) - Easier to use as user can click the instructions provided in the form of menu or icon, Command Line Interface - Difficult to use since user have to type the exact spelling and punctuations, as processor, disk, memory ,network usage - Monitor Performance,

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