With the NI-VXI driver that you have installed, you will find examples that have shipped with the product.
With a VXI/VME system, the preferred API is NI-VISA.
For example on Windows systems, you could look for examples based on NI-VISA under: C:\VXIpnp\WinNT\NIvisa\Examples (note that "WinNT" may be replaced with "Win95" on some versions of Windows).
You can also check out the
Development Library on the NI Developer Zone for VXI/VME example code.