What is considered 'Inactivity' within Service Desk Plus

What is considered 'Inactivity' within Service Desk Plus

We want to lower our inactivity timer within Service Desk Plus it's currently set to 6 hours. Great for Admins horrible for end users who change networks and don't sign out of their sessions. We want to know what is considered inactivity within service desk plus or when the inactivity timer starts?

Does moving the mouse around keep it alive, or is it based on your last reply? 

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