Hello,
I could not find any resources on this on the National Instruments website, but I did a search in Google for "MEGADAC LabVIEW" and got 57 hits. I recommend you check some of these links to see if any of them might have some helpful information.
Good luck in your search, and have a good day.
Sincerely,
Darren Nattinger
Applications Engineer
National Instruments