[horde] Session question

[Daniel Herrero Martínez]

Hello list,

we have some horde users who share a computer, with Windows OS and just 
one user account.
As long as they share the same user account, when one of them logs in 
into horde, if he exits
webmail just by closing the web browser window instead of clicking the 
logout icon (it ocurrs frequently),
his horde session is available to the next user who connects to horde.

¿Is there any way of preventing this behaviour?

Thanks,

Regards
Daniel Herrero