What does the BlueZ applet in Gnome do "behind the scenes"?

What does the BlueZ applet in Gnome do "behind the scenes"?

I have this Apple wireless keyboard that I've successfully paired and gotten to work with my Ubuntu laptop (using a bluetooth dongle). The laptop is running 9.04 Jaunty and I used the nice little BlueZ applet that comes with Gnome to do the pairing.