Summary
In the long run, unmanaged code will die out and become a distant memory for Windows developers. In the short term, using unmanaged code remains a way of life. It's critical that you know how to build and deploy managed code that can interoperate with unmanaged code. Fortunately, the CLR provides an easy-to-use interoperability layer that works in both directions. It makes it possible to integrate the old code you've written in Visual Basic 6 with projects you are now creating with Visual Basic .NET.
An interop assembly contains COM type definitions that have been translated into managed types. It provides a gateway into a COM DLL because it contains a set of managed types that allow you to indirectly program against the types defined ...
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