Please see my comment to the question. Consider this as an answer: what you want makes no sense.
This is a way to look at this: if you need such a universal way of access, it is already embedded in the DLL. If you want to develop such thing, you need to develop some architecture, such as plug-in architecture, where a set of different DLLs should implement the same interface (or interfaces). If this is not the case, or a similar case, your "I want" would be not very productive
If you have some different vague ides, it still should be more specific. If you can explain such thing, I'll gladly discuss it with you.