[horde] session information

[Kevin Konowalec]

So I've been pulling rudimentary stats out of the horde log files  
with some success, but I was wondering if there was more available.   
What I've been asked to do is come up with a real-time(ish) snapshot  
of what's going on in our horde cluster.  The most important of which  
is a list of all users currently logged on to the system and which  
machine in the cluster they are currently on (this is helpful data  
when troubleshooting).  Now I can derive all that information from  
the horde logs BUT what I can't tell is the case when a user logs in  
and then just shuts off the browser without logging out properly.   
 From everything I have available at the moment it would look like  
that user was still logged in.  Is there a way I can query memcached  
(which handles my sessions) to determine if a user's session is still  
active?