Use of ASFixedMatrixConcat()

Hi,

Can any one please let me know how this function is working.
Actually in CoreApiReference.pdf of Acrobat SDK, it is mentioned that this api mulitipes two matrices and strore result in third one.

void ASFixedMatrixConcat (ASFixedMatrixP result, const ASFixedMatrixP m1, const ASFixedMatrixP m2);

But when I use it I am not able to understand does it really do matrix multiplication of mathematics.
I have seen code using this for matrixTransformation.

Can anyone let me how it works, with at least one example.

Thanks and Regards,

Saffiuddin Sheikh