Laravel 5 does not limit the number of sessions a user may have open, so the web application may be open in several browsers of several computers.
In a project in which I am participating we need that the user can only have an active session, so if it is authenticated in a browser, the rest of sessions have to disappear, so the user can not use the web application in the other browsers, except in the last one. The example is developed with Laravel 5.4.