Speaking of apps, if you want to quickly hop into another one without going to the home screen, you can hit the menu button to bring up a window of running apps. (intomobile.com)
Tap the three dots on the top - right edge of the screen, and go to Home screen settings. (digitaltrends.com)
Before I could switch the song easily now i have to swipe, unlock, open the app go to the home screen and change the song. (carphonewarehouse.com)