In creating an iPhone app, is it possible to generate a popup alert on the iphone (similar to a Push notification) when the app has been closed. A simple example would be t
Nope, you'd have to use push notifications. Your app would have to be running to display any alerts.
All the workarounds I can think of would require internet access: add an event to a calendar somehow, or again, use push notifications. urbanairship.com has a pretty straightforward push notification service you could utilize.