Smartphone Companion app
Details of the app are mentioned in the doc for which the link is provided below.
The timing of this post might suggest that i'm trying to imitate what apple did with 'continuity' for ios&osx, but I had this thought in my mind for a long time (I'm sure many people had). I'd prepared this doc with brief description of features I would want, so that I can share it with some developer. I'm looking out for developers who can code this app to reality. I can help in adding new ideas and design of the UI (though i'm not well versed with UX designs).