Getting information in screen when something happens on an other shell

Some time ago, I started to use screen in my terminal instead of opening
multiple registers or gnome-terminals. See my starting entry here.

Now, I've running some simulation scripts which receive messages. When you
are on a different  shell in screen and something happens on an other screen-shell, you can get notified by a special key sequence.

Go the the shell in screen, where you like to receive notifications and press

After this you get a hint, when something changes in the output.