Woking of CLR

Question

I just want to know that how does actually CLR works.What are the stuffs contained in the CLR .

Does any new thing comes into play other than CLR when we use any other language like COBOL.NET or any other language or CRL has the capabilities of handling it by its own if so does CLR contains all the compiler and debugger of all supported language in it

Please do not paste any links.