Stopping users logging in via X

[PFJ]

Hi,

I'm trying to write a cron job which logs users out at (say) 10pm and
then locks all logins via the normal X login service until 3pm the next
day.

It's not a problem logging people out (just restart X), but I don't know
what services I need to kill to stop users logging in via the normal
gnome login. I don't want to stop all logins as I still need to update
the box remotely (using ssh).

Any clues on this one?

TTFN

Paul
-- 
"If I face my God tomorrow, I can tell Him I am innocent.
I've never harmed anyone. I have cheated no one. 
I have deceived no one. I have hurt no one. 
Except myself. And that He will forgive me." - Hans Holzel
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