Reading the utag.js code directly, the session id is a just a timestamp tracking when someone landed on the page without a valid session in the cookie (after more than 30 mins). So theoretically two users arriving at the exact same time in milliseconds could be assigned the same session_id. We don't use that for any purposes than general tracking of user's sessions as far as I know. RDses: function(o, a, c) { a = (new Date()).getTime();//this is where the session is calculated c = (a + parseInt(utag.cfg.session_timeout)) + ""; if (!o["cp.utag_main_ses_id"]) { o["cp.utag_main_ses_id"] = a + ""; o["cp.utag_main__ss"] = "1"; o["cp.utag_main__sn"] = (1 + parseInt(o["cp.utag_main__sn"] || 0)) + ""; .....
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