Jeffrey,
The ID Net Library's LabWindows/CVI instrument driver for the 4192a offers more control and functionality support that the contributed LabVIEW driver.
You have some options:
1. Use the CVI driver in a C-based environment
2. Convert the CVI driver using the conversion feature in LabVIEW. Using the menus, follow the path: "Tools >> Instrumentation >> Import CVI Instrument Driver..." Then, select the .FP file from the downloaded driver. You will then be able to use the features of the CVI driver within LabVIEW.
Finally, I found an application note (AN 346) on Agilent's website that may be helpful with the 4192A. I have attached that file below.
I hope that's helpful.
--Bankim