Interpreting a method with three return types in C++

I found several lines of code in this header FTD2XX that seem to have function signatures with three return types. How do I interpret this? Here is an example

FTD2XX_API
FT_STATUS WINAPI FT_Read(
                         FT_HANDLE ftHandle,
                         LPVOID lpBuffer,
                         DWORD nBufferSize,
                         LPDWORD lpBytesReturned
);

All help is much appreciated.