Same computer, I do use dropbox as my multiple computer solution, but I also have 2 installations since I run an automatic clan bot as well as my normal characters so the global preferences are different. (Ideally I would like everything the same but the global preferences)
I want to share the same script/data folder between the bot and my regular guy because I tend to keep making the same mistakes.
I tend to upgrade/edit scripts on one and forget to copy it to the other. So I am a disorganized mess when it comes to doing updates or making changes.