How framework speaks with OS

Hello ,

is there some one who can give me some information ,about a book or a URL on how .net framework speaks with Windows

make it clear (its not how application work with framework , or some thing like how clr works)

how the entire .net framework speaks with Windows , what it uses (does it use api's or some thing new if api's please please specify the url where i can get the information about the same)


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How framework speaks with OS