Help with integrating 4GL to Win32 DLL

Hi

We have a partner who is developing in 4GL, who needs to interface with a Win32 DLL written in ANSI C. One of the functions requires a pointer to a compound data structure (consisting of 3 integer values). That means that the Progress developer needs to somehow combine 3 integer values into a single structure and then pass the address of this structure to our function.

Is it perhaps possible to populate a character "string" with the 3 integers and pass a pointer to this string to us?

Thanks