After deploying my service on CentOS server it's occured that session opened in one browser is "seen" in another browser. (Previously i've develop my service on Windows 7 XAMPP localhost and didn't met this issue). Looking for PHPixie\Auth\Login sources i have found that variable $allow_multiple_login in Password class is declared but never after been used. Is this bug or feature? Does my issue is CentOS (SELinux) specific? And how can i change the source to fix this issue (for example, adding $_SERVER['HTTP_USER_AGENT'] or so to cookie)? Thanks!