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To start push development, you must visit Apple’s iOS developer Provisioning Portal. This portal is located at http://developer.apple.com/ios/manage/overview/index.action. Sign in with your iOS developer credentials to gain access to the site. Here at the portal, you can work through the steps needed to create a new application identifier that can be associated with a push service.
There’s a fair amount of detail involved. Make sure you hit every point. The following sections walk you through the process. You see how to create a new identifier, generate a certificate, and request a special provisioning profile so you can build push-enabled applications. Without a push-enabled profile, your application will not be able to receive remote notifications.