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Different layers in Windows Architecture

Explain how many different layers comprise in Windows Architecture?

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a.    At the bottom layer there consists a DLL files which are most important in playing a big part in the architecture.

b.    The layers consist of NTDLL.dll is below the bottom layer as well as WIN32K.sys files these consist of number of user-mode functions.

c.    The user-mode functions comprise of stubs which are used to call other type of functions as well as the RTL (Run Time Library).

d.    The 2nd layer of Windows Architecture consists of the libraries which is having the Win32 API and contains the user-defined functions as well as some part of the components.

e.    This layer similarly consists of .DLLs but in the form of components as well as Win32 APIs.

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