Using Unix Command Line to force logoff of other users

Hello - I am the administrator for my family's Mac (OS X - 10.4.8). Four of us in the family share the system. Frequently, my family members forget to logoff. I would like to be able to force them off via the Unix command line. Can't I sign on as root and execute a "forced logoff" type of command?

Thanks to Mihalis and Jarik for the additional info.
I'm back now with a question. I have a user named "visitor" logged on. I issued a killall command which killed all the users processes except one. Using /Applications/Activity Monitor.app, I can see the process is "loginwindow" and it is owned by visitor.
However,
ps -u visitor
reveals no running processes. Assuming I only had command-line access (no GUI to use Activity Monitor.app) and had multiple users logged in, how can I discover which loginwindow PID belongs to visitor?
msq
EDIT: I went ahead and sudo kill PID the loginwindow process owned by visitor and realized that
ps -axj | grep visitor
worked to reveal the loginwindow process owned by visitor. But when I logged visitor in (Fast User Switching) and ran sudo killall the Activity Monitor.app identifies the loginwindow as being owned by root but ps -axj | grep visitor shows the process belonging to visitor.
Something weird in the depths of Leopard's UNIX land, but I think I can find my way around now.
Thanks, everyone.
Message was edited by: mistersquid

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