Force user logout?

[Craig White]

On Sat, 2006-02-18 at 22:40 -0700, Alan Dayley wrote:
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> Let's say a user logged into a computer and set the screen saver
> password (My son did this against house rules to keep his siblings off
> the computer).  This user is no longer available (He is now in bed).  I
> don't know his password but I know the root password for the machine (Of
> course!).  I want to force the user to logout so the machine can cleanly
> shutdown.
> 
> Google provides many answers and I haven't found the clear one yet.
> Logged in as root on another console, how do I force a clean logout on
> the (now sleeping) user?
> 
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isn't root password acceptable to xscreensaver? I thought that it was
supposed to work.

I don't know an answer for a clean logout but I would guess that it
would probably involve a sighup to gdm/kdm

Craig