Two Stores - One Database

[gjh42]

What you're talking about is two faces to one store. It should be quite feasible. One thing I don't know about is if the two sets of software try to update the db at the same time, whether there is a possibility for confusion.

Database prefixes are only useful if you are trying to have separate sets of information in one db container. Most everyone has no need for this; the prefix is just an automatic artifact of auto-installers.