> Which is why Linux desktops really need a secure attention sequence
> such as the Ctrl-Alt-Delete used by Windows (and before that, VMS).
> No application may trap that keystroke, and it leads you to a screen
> with only the password entry dialogue and (as far as I know) no
> communication with other parts of the desktop.
That's a very good point. It's important to have a secure login path. This is an especially important issue in a shared computer lab, where people can log into any machine they like.
It would be nice if gnome or KDE could be configured to request an "uninterceptable" keystroke combination before allowing you to log in through gdm or xdm. I don't know enough about X input handling to know how feasible this would be.