The answer is, you can't. It's a limitation of how WP7 handles notifications.
You need to get a URL from the push notification sevice for each device everytime your device connects.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.