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Or consider an instant messaging client - incoming messages are pushed from the IM service, but not directly to the iPhone in the format it understands, so the

Or consider an instant messaging client - incoming messages are pushed from the IM service, but not directly to the iPhone in the format it understands, so the app developer would have to operate a server that maintains an open connection to the IM server for each app user and forwards incoming messages to their iPhones.

collint 18y ago
It really is a good thing that multiple pieces of software exsists for doing just such a thing. Modern messaging middleware can handle in the range of hundreds of thousands of messages per second. Talent and domain knowledge will be important, but iPhone "push" changes little.