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Virtual Machine Operating Systems.

Most modern operating systems consist of layers. Just over a hardware layer there's system kernel implementing functions that extend processor instructions functionality. User programs can use both.

There are also Virtual Machine Operating Systems, that add virtual machines layer over hardware, enabling to run multiple operating systems that share hardware resources simultaneously. Each Virtual OS uses part of available resources and runs a kernel.

 photo osstructure_zps5e8abc69.png

Source: [12].

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