A general purpose computer, or a very locked down thin client. Like the world of AOL users. I would have suggested the latter, otherwise the system would have

A general purpose computer, or a very locked down thin client. Like the world of AOL users. I would have suggested the latter, otherwise the system would have been a lot more open. General purpose computers give purchasers administrator/root access by default. If you don't have that, you have a thin client run by someone else.