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The Denali project provides system support for running several mutually distrusting Internet services on the same physical infrastructure. For example, this would enable a developer to push dynamic content into third party hosting infrastructure such as content distribution networks. To accomplish this, the authors propose new kernel architecture called an isolation kernel to isolate untrusted applications. An isolation kernel is a simple, thin software layer that runs directly on hardware (And hence below operating systems), whose function is to subdivide a physical machine into a set of fully isolated protection domains. Isolation kernels resemble virtual machine monitors in that they expose a virtualized hardware interface to a set of virtual machines.
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