Hi tater,
One way to accomplish this would be to compile the simulation program into a dll or a series of dlls and call them from LabVIEW. If your Parker Motor program has its own user interface, then building that app as a standalone executable and then calling it with a System Exec.vi call would be your best bet. For more information on DLLs and external code in LabVIEW see the following links:
http://zone.ni.com/devzone/cda/tut/p/id/2719
http://digital.ni.com/manuals.nsf/websearch/8D930295FFBF9F7686256D2C00624728
The other option would be to use Measurement Studio to control your devices instead of LabVIEW and integrate the simulation into Measurement Studio.
Test Engineer - CTA