baldy38 said:
Ok, thanks, well at least I got that bit right. But...
a) if it's a new network, can I have that working wirelessly from my main router? Apple guides seem unclear on that
b) if it's the same network, likewise...
Not sure I understand exactly what you're asking here, but if it is what I think it is, it works thus - you have two options:
1. Get the Airport Express to join your existing wireless network - which for the sake of example, we'll call "Home". This doesn't need the Airport Express to be wired into your router, it joins the existing "Home" network wirelessly. Once this is done, when your PC / iPhone is connected to the same "Home" network wirelessly, you should see there is an AirPlay option in the relevant applications and you can then choose to stream music to this.
2. Get the Airport Express to create a brand new wireless network - which for the example, we'll call "Airport". Again, no need to connect into your router as, essentially, it's not having any interaction with your router at all. Your PC / iPhone will now have the choice of either:
(i) joining the the new "Airport" wireless network - when connected to the "Airport" network, the PC / iPhone can stream music to your Airport Express, but can't connect to the internet or anything else attached to the "Home" network.
(ii) joining the existing "Home" wireless network - when connected to the "Home" network, the PC / iPhone can connect to the internet / other devices connected to the "Home" network, but can't stream music to the Airport Express.
Hope that makes sense and answers your question!