== A brief sad note about root passwords

As far as I can see, the inevitable result of having several different
root passwords across your systems is that a smart intruder who
compromises _/bin/su_ on a single system will sooner or later collect
*all* your root passwords.

(Or perhaps other people are better than we are at typing the right root
password at the current _Password:_ prompt.)

(Please do not suggest _sudo_ as the solution. For a start, we'd still
want actual root passwords that are distinct from our own passwords.)