Memory Management - Shares out memory to programs that need it the most, removes memory from programs not in use and controls use of Virtual Memory., Device & IO Management - Controls the computer, input devices & output devices and sends data to appropriate output devices., Security Control - Requires login with username and password, records logged in users and what they do. These logs can only be viewed by a computer administrator., Program Management - Launches & aborts programs when instructed to., File Management - Keeps track of all the files in a computer, locates stored files and saves the files to the memory., Logging Events - Logs everything that occurs on a computer and the hardware, is useful for diagnosing problems.,

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