[saagarjha]

Sure, putting on my layman hat: "Add the observer 'self' to some centralized place get a notification of some kind for when the app becomes active. Something to do with a 'shared application' and a 'selector', maybe they are some additional context?" Of course, the latter two are things you'd know if you have used Objective-C even a little bit, with the former being a fairly standard nomenclature for a global and the latter being a crucial part of the language.