Is it possible to call function pointer value?

Hi All,

I know that it is possible to call dll exported functions within
cormanlisp. But I'd like to call a C function which is passed as
a function pointer.

Is it possible to pass a function pointer into cormanlisp function and
call it within the lisp function?

Suppose that there is a DLL function 'dll_func' generated by
cormanlisp. It takes an argument of function pointer 'fptr'. Is it
possible to call the function pointer within the function `dll_func'?
Assuming that there is a data type :func_pointer, I'd like to write
code shown like the following:

(ct:defun-dll-export-c-function (dll_func "dll_func")
    ((fptr :func_pointer))
  (funcall fptr))

Thanks in advance.

Jong-Kyou Kim