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2. Onion model - Wikipedia

   en.wikipedia.org/wiki/Onion_model

   A template for an onion diagram. An onion diagram is a kind of chart that shows the dependencies among parts of an organization or process. The chart displays items in concentric circles, where the items in each ring depend on the items in the smaller rings. [1] The onion diagram is able to show layers of a complete system in a few circles.

3. Protection ring - Wikipedia

   en.wikipedia.org/wiki/Protection_ring

   In a monolithic kernel, the operating system runs in supervisor mode and the applications run in user mode. Other types of operating systems, like those with an exokernel or microkernel, do not necessarily share this behavior. Some examples from the PC world: Linux, macOS and Windows are three

4. Package diagram - Wikipedia

   en.wikipedia.org/wiki/Package_diagram

   Class: a representation of an object that reflects its structure and behavior within the system. It is a template from which running instances are created. Classes usually describe the logical structure of the system. Interface: a specification of behavior. An implementation class must be written to support the behavior of an interface class.

5. OpenVMS - Wikipedia

   en.wikipedia.org/wiki/OpenVMS

   The architecture of the OpenVMS operating system, demonstrating the layers of the system, and the access modes in which they typically run The OpenVMS operating system has a layered architecture, consisting of a privileged Executive , an intermediately privileged Command Language Interpreter, and unprivileged utilities and run-time libraries ...

6. Operating system abstraction layer - Wikipedia

   en.wikipedia.org/wiki/Operating_System...

   An operating system abstraction layer (OSAL) provides an application programming interface (API) to an abstract operating system making it easier and quicker to develop code for multiple software or hardware platforms. It can make an application less dependent on any one specific operating system.

7. Architecture of macOS - Wikipedia

   en.wikipedia.org/wiki/Architecture_of_macOS

   Additional diagram of macOS architecture (2017 update) The architecture of macOS describes the layers of the operating system that is the culmination of Apple Inc.'s decade-long research and development process to replace the classic Mac OS.