Does such an invention actually exist?? From a Stephen King interview:
http://www.horrorking.com/interview10.html
Question: Do you ever use any of these new software for making up characters or plots? Do you think these story writing softwares take away from the imaginative process?
Stephen King: Nah. Plot software is just a high-tech version of Edgar Wallace's plot-wheel, invented in the '20s. I use what comes out of my head, or what I see happening around me.
http://www.horrorking.com/interview10.html


