The Brainstem is not capable of running LabVIEW (obviously).
LabVIEW code (VI's) cannot be run on the Brainstem, since the runtime engine
won't run on it.
You could buy the LabVIEW Microprocessor SDK and try to compile it's C code
to the Brainstem. But it will be expensive (license fee and long development
time).
Or, you can try to make VI's that add small parts of C or assembler code to
a string, and compile that. Much like how mindstorms does it...
You can also work with the compiled C code running on the Brainstem, for
instance through a serial port.
For hardware needed to communicate with it, I'd suggest a serial cable. It
is used to program it, so it should be able to communicate over it. This is
not really LV related though.
Regards,
Wiebe.