LG introduced Slide Aside with the G2. It allows you quick access to three apps that are currently running in the background. When you want quick access to an app you are currently running, just swipe it to the left using three fingers. You can do this up to three apps.
When you want to quickly access any of the three apps, just swipe to the right using three fingers from any screen. You can also access them from the notification panel.
Hit the break for a video showing you how to use Slide Aside, and be sure to check out our other LG G2 guides.