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This Concept Map, created with IHMC CmapTools, has information related to: Chapter 6 Intro, Virtual Machine Accomplish Operating systems typically use two levels of access to the system resources. The O/S has access to everything, while user processes are more limited, Operating System Support includes Communication and invocation, Virtual Machine definition Multiple processes can run at the same time on a hardware device, an operating system provides a virtual machine, giving the user the impression of control of a system. This includes protecting each user process from interference by another process., Operating System Support includes Processes and threads, Operating System Support includes Operating system architecture, Operating System Support includes Protection, Operating System Support includes Operating System Layers