Rebecca,
>> 2. I know I can detect a NI VISA driver to read the device. However, if it's a USB pen drive, the windows will automatically load the Windows driver for the USB, the PC will bypass the NI driver. So, I can't use the NI Visa driver wizard.
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There is a way to assign NI-VISA RAW driver to your Pen device, instead of assigning the Windows default driver. First create an INF file that explicitly contains your VID/PID. You can machine-generate the INF by using NI-VISA USB driver wizard tool. Once the INF is generated, place it in the Windows/INF direcoty. Next open the Control -> System -> Device Manager tab, then go for your USB device node then "Update" the hosting device driver replacing with the generated INF file, which makes NI-VISA RAW driver host your Pen device instead of the Windows default driver.
This approach allows you to override any class driver that host a class device, swapping to an arbitrary device driver to host, as long as a correct INF file (containing explict VID/PID entry in it) is placed in Windows/INF directory.
