The NI-DAQmx Help contains API overviews and general information about measurement concepts. Select Start » All Programs » National Instruments » NI-DAQmx » NI-DAQmx Help.

The NI-DAQmx C Reference Help describes the NI-DAQmx Library functions, which you can use with National Instruments data acquisition devices to develop instrumentation, acquisition, and control applications. Select Start » All Programs » National Instruments » NI-DAQmx » Text-Based Code Support » NI-DAQmx C Reference Help.