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who shows "phantom" users

Recently I have noticed (legitimate) users logged in on one of our
servers with no processes running.

I know for a fact that they log into the server via (open)ssh, and
eventually close the ssh connection.

Nonetheless, who still shows them as still logged on (as does last). 
On the other hand, w does not show them as logged on.

Is there a way to get /var/log/wtmp to update itself?  Any ideas what
the cause of this might be? (ssh shutting down impoperly?)

It's not a huge problem, but an annoyance.

Thanks for any input

Thomas R. Shemanske                
(Mailing Address)                  (Office/Internet Information)
Department of Mathematics          203 Choate House
6188 Bradley Hall                  thomas.r.shemanske@dartmouth.edu
Dartmouth College                  http://www.math.dartmouth.edu/~trs/
Hanover, NH 03755-3551             (603) 646 - 3179 
Directions:  http://www.math.dartmouth.edu/~trs/choatehouse.html
Office hours: 

Summer Term Office Hours:  By appointment

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