So that means that I could not run the two next to each other? Is it a database issue or a do you mean by user authentications that people would have to register in wordpress again to comment on blog entries for example?
Sorry if that sounds naive but I am a little lost here.
Fabian
You can run as many databases as your domain host allows. It simply means, they'll both require seperate registrations to comment or view or however you set your permissions to allow anything.