Encebollado,
The source code for NI-DAQ is not publicly available. However, the Traditional NI-DAQ functions are documented in the Traditional NI-DAQ Function Reference Help. This document is available in the following location:
Start >> Programs >> National Instruments >> NI-DAQ >> Traditional NI-DAQ Function Reference Help
Furthermore, example programs are available in the following location:
C:\Program Files\National Instruments\NI-DAQ\Examples
Good luck with your application.
Spencer S.