How to kick out the Users from their live session.

Hi,

I am the P6 Administrator/Coordinator of my company.  There are times when I really need to kick out the User from their session. 

Is there a feature in Primavera P6 Release 7 SP2  to do that?  Despite a blanket e-mail to all Logged in Users to Log out, I always have several stragglers in there refusing to Logout or they've left themselves Logged while they are on break.  At this time, I am managing about 150 concurrent Users.  There are approximately 20 to 50 Users at any given time. 

I need an easy way of kicking them out once the notiication grace period is over.