LG has announced the release of its QSlide SDK in an effort to bring more windowed applications to its Android phones. QSlide is LG's framework for miniature windowed apps, found on the G2 and other current LG phones. Similar to Samsung's Pen Window, QSlide apps can be used in the foreground while other fullscreen apps are running in the background.
Today's SDK launch makes it possible for third-party developers to bring this functionality to their own apps. SDK features include switching between floating and fullscreen mode, adjusting window transparency levels, customizing the appearance of the window and adding a quick launch icon to the QSlide tray in the notification shade. Interested developers can pick the QSlide SDK from LG's developer site, or through the Android SDK Manager. LG's also got documentation available as a guide for developers.
You'll find more info and download links at developer.lge.com, or alternatively hit the link below for a general walkthrough of QSlide on the LG G2.
Source: LG Developer