Kevin,
Please clarify what exactly you want the user to do to analyze the waveform. Do you simply want the end user to view the data? If so, you could take the data from the file and plot it to a chart in which the user can scroll back and forth to view the waveform.
Also, please clarify what you mean by "
Is there a way to put a stream into one of the NI components so that it can control it?"
Thanks
Manooch H.
National Instruments