Passing address of multidimentional array

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I have an array defined in main.c and with to access it from a
function in another file preferrably using array indices but pointers
would be OK. I am not sure how to specify the function parameter or
how to index the elements via the foreign function. Would like a
little advice rather than proceeding blindly because I often find that
just because something compiles it is not necessarily correct.

Thanks,

gtb

~~~~~~~~~~~~~~~

int arr[20][30];

main(int argc, char** argv)
{
int rval;
...
rval = functionInOtherFile(arr);
}

//Other file here.

int functionInOtherFile( int* arr[}[])
{
//???
}
.

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