the help page says that the ipad and blu-ray player need to be on the same wifi, and the blu-ray needs to be hooked up to the internet. I would presume that the

the help page says that the ipad and blu-ray player need to be on the same wifi, and the blu-ray needs to be hooked up to the internet. I would presume that they're using some internet-accessible service not wholly dissimilar from a NAT traversal to establish the connection. example: 1. ipad connects to the service over the internet from some ip address, tells the service its local ip (or mac address or something). 2. blu-ray player connects to same service from the same ip, asking for the local address of the ipad coming from that internet ip address. 3. profit. there are some wrinkles there, but i imagine that's the basic idea.