Back button pressed!

if the user presses the back button while using the app, how can I send my app to the background(it should keep working) and show the home screen of the device?



App Inventor apps presently cannot run in the background...



Me, after Enis's answer below:

Awww...

It's going to happen sooner or later... just when we're not sure.  It's called services.  An app can't run in the background without a service.

There are some tricks you can use to force it to stay active... Search forRunning in the Background and you'll find lots of info...