Notification Center in iOS5

Is 开发者_开发问答New Notification Center feature alternative to APN(Apple Push Notification Center)?can we give notificaion from webserver to this?

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No one with detailed knowledge of this can answer without breaking their NDA with Apple.

From the keynote it looks as though the Notification Center is just a new way of organising the existing system of notifications (i.e., push and local). You would have to look in the iOS Developer Center to find the technical details.