Hi art,
There are a couple resources available to get you started.
This KB talks about using LabVIEW as an ActiveX server which will enable to you call the VI already created and retrieve data from it. An example program which uses ActiveX to call your VI is installed with CVI and is found here on your hard drive: C:\Program Files\National Instruments\CVI80\samples\activex\labview or
here online. The library for LabVIEW's ActiveX server is found in the LabVIEW Help under Property and Method Reference -> VI Server. This should give you a good place to get started with your application.
Test Engineer - CTA