I'm not sure. All I can tell you is when I switch, my host sometimes reports that I scrambled the brain. She feels like she's influenced by me instead of herself, and as a result she changed because I was different.
I think can you hack your life and change your life, along with ultimately, your will. You follow your own programming, but you also make changes to your programming. It's this weird property that really complicates the question of free will or not