furmanlim,
I may not understand your question. However, if you are asking how to trigger an acquisition using NI data acquisition hardware, then the place to start is the shipping examples that come with LabVIEW.
After launching LabVIEW, choose Help >> Find Examples.... Choose the Search tab, then scroll down in the keyword list and you'll see "trigger" and "triggering". I think triggering will give you the most results, including options for the Traditional DAQ API as well as the newer DAQmx. The one that is right for you will depend on whether you are using an external digital trigger signal, or triggering on a certain analog level of an input channel, etc.
If I've misunderstood and your question is really a software question (how to get data to appear in a graph or something), then please respond with more details of what you need help with.
Regards,
John
