Launch any application on top of the current application!
Typical usage scenario
1. While using a web browser you need to use calculator.
2. Press the Sub-Launcher's trigger to switch to your favourite launcher.
3. Launch calculator as usually, and do your calculations.
4. Return to web browser whose state remains totally unchanged!
Without Sub-Launcher you had to quit web browser, switch to calculator, and then launch web browser again. This caused web pages to load again, or worse: same data submitted twice to the server.
With Sub-Launcher you can use your favourite launcher to sub-launch any application - the web browser & calculator combination is just an example here.
