But what if the goal was to invoke the script from within arc catalog or ARCMap ? (Creating a button that I can just click on to run the outside executable). Outside the arcgis software, double clicking the .py that runs the exe works just fine. No parameter bx popping up. However, once you try to run the py from inside arcgis, a user is then forced to click ok in the parameter box just to run the outside script. Really want to bypass the parameter window (since no parameters exist in order to run the exe). Just FYI, I made 1 required parameter using a default text which basically just said "Click OK to run the program."