You just have to put a string in the first argument of your program that contains your vision process, and it will attempt to run whatever vision process has that string as the name. If that vision process doesn't exist, you will get a fault.E.g. CALL VISION_PROCESS('myVisionAlgorithm') would attempt to run the vision process 'myVisionAlgrithm'.
I wasn't sure if an AR would hold a string or not. I was under the impression it could only be a numerical value. I see it can be either/or.