Given that they're mutually exclusive, their boundaries are with each other.
This is not remotely true, even if you say it six times over and hold your breath. Evolutionary theory will not die if any currently known form of ID prevails. Darwinian evolutionary theory does not insist that God or little green men can't tinker with genomes, so if we discover he does, or they do, it won't make a big dent in evolutionary theory. We'll still dig oil, protect and enhance crops, guide veterinary medicine, create commercial chemicals, and track, predict, and destroy new pathogens using Darwinian evolutionary theory.