Apps can be pinned to the main window. Pinned apps are always running and can't be closed. They are also started automatically when the myApps client is loaded.
The "app focus" can be used to define a default app for the user. It is started and shown automatically when myApps is loaded. When closing other apps the app is shown instead of the home screen, presence state is always displayed on the app in focus.
More information:
https://wiki.innovaphone.com/index.php?title=Reference13r3:Concept_myApps#Features