[lug] Disconnectin user / Closing idle connections

[Shannon Johnston]

Hello All!
I had a quick question. Sometimes my connection will drop from a remote
system. (Or I'll close the terminal without properly exiting.) 
When I run a who command next time, the previous connection still remains.
I've seen them as old as 5 days idling.
That brings me to my question. How do I kill these connections? Also, how
can I kill the active connection of another user?

Thanks,
Shannon