If you application is an exe you can use the sys exec function in labview. This will allow you to utilize the command prompt in LV. If you application is a DLL you can use the call library function. This will allow you to pass data in and out of the DLL using the correct function prototype. The sys exec is under the communication palette. Hope this helps. ActiveX is more for control external applications such as word or exec.
BJD1613
Lead Test Tools Development Engineer
Philips Respironics
Certified LV Architect / Instructor