Software update applet ?

[stan]

I've got 2 7.10 machines, one with a Gnome desktop, and the other with a
KDE desktop, and on both of them the applet that notifies me of abailable
software updates, and allows me to install them seems to have gone missing.

How can I reinstall this applet?

-- 
One of the main causes of the fall of the roman empire was that, lacking
zero, they had no way to indicate successful termination of their C
programs.