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DLL functions or shared variables? Or something else? I have a Labview 2014-64 executable (or I can build a DLL) that runs one piece of equipment, the X-ray. The other engineer has a large CVI Labwindows 2015 + MS Visual Studio 2012 (C++) executable that runs everything else. I want the Labview code to be a slave of the CVI code, accepting commands to turn X-ray On or Off, reporting failures, and the like. Translating the X-ray code into C++ would be possible in principle, but not fun. Shared variables look easy, but I'm kinda scared of them. I would define all the shared variables in my LV code, since I'm more familiar with LV, then use them in both. There's a thread in here called "Shared Variable Woes" so maybe I should be scared. In the alternative, I tried building a proof-of-concept DLL in Labview, and calling its functions in CVI/C++, and it works, but it's kinda clunky. (I'm attaching it below in case you want to play, or advise.) Your advice would be appreciated. XrayDLL.zip