> Can you produce an ordinary Windows DLL with OCaml?
> Can you use a function to that you got a pointer and whose C style 
> header you know?
> Can you access C style structures you got a pointer to from 
> somewhere?

Yes, all this can be done with the help of some C stub code.  You need
to compile the Caml code to a C object file (option -output-obj),
then write a bit of C stub code to give a C interface to your Caml
code.  Finally, the C object file generated by Caml can be linked with
the stub code and the Caml runtime system to produce a DLL.  Not
completely trivial, but doable.

> A related question :
> Can you use COM objects with OCaml?
> Can you create COM objects with OCaml?

The CamlIDL tool (http://caml.inria.fr/camlidl/) lets you create and
use COM components in Caml.  It automates the creation of the C stub
code mentioned earlier, and also comes with handy scripts to help
building the DLL as described above.

> Can those objects be poolable?

I don't know what a "poolable object" is.

- Xavier Leroy
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