Basically, we've designed it so that you can exchange information with your registered friends. I'll give an example of the kind of information that could be exchanged. Let's say someone buys a new game. When they switch on their console, a question could appear on the screen: "Do you want to let your friends know you have bought this game?" If you select "Yes", the message "X has bought the game Y!" will pop up on your friends' Message Boards. You can send messages like that from within the game, or you can make your own message to send to your friends. Actually, the example I just gave is still under discussion and has not been finalised yet. But I think it gives you an idea of the kinds of things that would be possible.
If we chose to, we could allow each family member to have their own account. But that just isn't what Wii is about. To give a very straightforward example, we're aiming at a console for everyone to use, but if we allowed everyone to have their own account, you would need to enter a password to use the console. To switch on Wii and be presented with a screen asking for your user name and password...well for me, that would have been unacceptable. In discussions, pretty much everyone agreed on this point.