So it seems that I need to learn more about exactly how listeners work and how databases work with them.
And especially how to have multiple databases talking to one listener and/or having more than on listener on one box.
I’ve been trying to install a 10g database and get it to register with the listener on the box, but it won’t do it.
I’m not sure if it is something to do with the fact the listener is only version 9 or if it is something I am doing wrong.