Hey Oren,
You can call TurboActivate (the part you include with your app) from FORTRAN, just like you can call an C dll. If you know C, we have a header file (you can download it on your API page after you log in) that describes the form and calling convention of all the functions. (With comments explaining what the functions do and the return codes).
If you need any assistance, we'll be glad to help.