How does the Android Lock Screen Camera work -

in android 4.2 new lock screen widget have been introduced. can accessed sliding left or right on lock screen.

one of widgets camera widget — camera widget behaving differently other widget – lock screen or otherwise.

once slide widget zoom full screen , onwards behalves app. lock screen camera has rich controls close impossible implement using confines of android.widget.remoteviews.

here 2 questions:

1. how work?
2. can replicated normal applications (or feature available system applications)?