Thanks for the reply.
A lot of this interwebs stuff goes right over my head, that's why I rely on Apple to dumb it down for me.

I would assume they are connected to the Airport Express than through my computer.
How would I know the difference?

The Airport Utility shows 3 wireless clients, I would assume that is me and my two neighbors.

I gave them the name and password and they are connected. That's all I can tell you.
Sorry for not understanding…