The COM Interop Services
In .NET, the COM Interop Services (CIS) layer provides access to existing COM components in a codeless and seamless way without requiring modification of the original component. COM components and .NET classes are conceptually similar although they are based on different models. They don’t know how to interact with each other, but their inherent similarity makes it easy for you to build a wrapper that exposes COM components as .NET classes and vice versa. The system module that provides this kind of service is the CIS, which is made of two distinct parts: one part makes COM components usable from within .NET applications; and one part does the opposite, namely making .NET classes callable from within a COM component. ...
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