Set Unique ID on home page

I’ve created a Internet kiosk. Public only accessed to a unique website on it. Every 2 minutes, a js timer is used to return on home page in case of inactivty.

I would like to count every ‘homepage’ as new visitor. Is it possible? And how?

I used Goal, but not really complete.

Is it possible possible to set unique and random ID everytime the homepage is set?

Thank you so much. (and sorry for my bad english) :wink: