List of logged users

[Oscar Picasso]

Hi,

I am looking for advises on how to implement a use case that is, think, quite 
common.

In my application users can log in. They can also loggout either explicitly or 
because of session timeout.

In one part of my application I want to display the total number of logged 
users and a list of each of these users.

My main problem is how to remove an user from the list when he is logged out 
implicitly by a  session timeout.

How would you solve this ?

Thanks

                
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