Software trigger

Background:

I am writing C code and calling the DAQmx API directly.  I am developing in VS community 2017 with the latest DAQmx.  I am using the Synch AI-AO example with success.  I changed the examples triggering scheme to have the AO task trigger the AI task with success. I have a PXIe chassis with a PCIe-6358 board.

Question:

I want to trigger the AO task from a DAQmx function call, a software event is going to start the AO/AI in one-shot mode.  I tried DAQmxSendSoftwareTrigger() with no success.  Is this idea even possible? 

Thanks,

Ed