More than one emulator running at a time?

Also I have created 3 emulators via Eclipse but I can't seem to select any of them. It automatically chooses the first one. I was wondering if there was a way round this on Eclipse?

EDIT: I have found out how to do it. However does anyone know how I could give an emulator an IP address so it is possible to reference it from another emulator??

Out of interest, why would you want to give it an IP?

Is this the way they will be interacting through whatever app you are developing when in production?