In my case I want to set up Moodle with two completely different courses. one as a democourse for the sailing school I am teaching, and the other one for my physics classes. So I will need two different welcome screens, backgrounds, themes, studenrts teachers, etc. The only thing that is identical for the two courses is the admin ( me ) and the server.
Do I habve to install a second moodle in another directory and setup something with virtual addresses (??) or is there a more simple solution?