Hey yqin,
The "Driver" is located here:
http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=D8732A6C078D01D1E034080020E74861&p_node=DZ52279&p_submitted=N&p_rank=&p_answer=&p_source=External
It should be noted that this is an example that was written particularly for one PDA, but has worked on several different kinds of PDAs. I have attached the readme file so that you can see the "requirements" before downloading the example (driver).
Good luck and thank you for choosing National Instruments!
Sincerely,
Gavin Goodrich
Applications Engineer
National Instruments
