Here is an interesting news, Cupertino has just developed a system which allows to communicate and exchange information with "closed" applications and this, via its servers which will transmit the information directly on the phone. Like for example, being notified of a message from your instant messaging without having launched the application.
Obviously, you will need to keep an eye open so as not to exceed your Data plan.
At the outset, Apple was not favorable, for the sake of saving energy. Today, the idea is well in place, the developers have received the tools necessary to create applications with this technique.
We discuss it on the forum.
[Appleinsider] via [mac4ever] and [itrafik]