how can I call a function from a dll in one step?

[2012ZGZYY]

I'm new to fireworks and find it well-suited for my current business needs. However, I have one remaining question: within fireworks's design framework, how can I implement calling a function from a dynamic library and utilizing its return value in a specific step? For example, I now have a third-party library third.so (or third.dll), which provides a function called int third_func(double x, int y). I want to load this dynamic library in a step and execute the third_func() function. How should I do this?