Originally Posted by Ginnia
OK, for anyone interested, if your home network is on a router (and I suppose everyone's is), and you need the "external" IP address for the Content Server to work outside your home, the IP address is the router address you can find in your router setup.
Keep in mind that occasionally, depending on your ISP, this IP address may change. This is where a service like dyndns.org comes in handy. When the IP address changes, if setup correctly, the router should update the service and the url continues to work. If you don't use this service and at some point in the future your sister starts having trouble check to see if the external IP has changed.