background app refresh question

hi. to put it basicly, it means that when ever you unlock your iDevice, or get a notification from an app, the system will update the app in the background. lets say for argument sake you got a notification from twitter, saying i had messaged you. you unlock your device, tap twitter, ... and this is where it changes. in the old way, it would then have to update the twitter timelines, when you open the app. so that can take a bit of time. in the new system, because it saw you get an alert from twitter, it updated twitter in the background, long before you even unlock your device to look at it. so when you open it, you will not have to wait for it to refresh / update the timelines, you can just start using the app straight away. this works rather well, and it means that i don't have to do a pull to refresh the screen to grab the latest tweets. they are already there. i hope this helps you understand how it works and what it's for.