I understand the general concepts and few of the specific ones, but that is not enough for implementing a managed code invoking unmanaged code.

A lot of unmanaged C++ code is found in DLLs that were written by external companies, thus the code in the dll cannot be modified.

Can you refer me to an example of a managed C++ class that instantiates a class that is found in a DLL ?
I would appreciate if the managed class would invoke methods of the unmanaged class that is found in the DLL.

Thanks.