1. A method for changing volume of traffic to a website, the method comprising: detecting an access request to the website by a user from a Web browser; consulting a user database to identify the user from the access request; identifying a method of calling the website from a value of a field or a value of a variable in the access request; consulting a promotions database to establish a determined amount corresponding to entries for at least one of the identity of the user and the method of calling the website; increasing a value of a points field associated to the user in the user database by the determined amount; sending instructions to the Web browser to display one of: information indicative of at least one of an increase in, and the possibility to increase, the points field associated to the user in the user database, the points field being representative of a benefit to the user; and information indicative of the possibility for the user to register in the user database; and opening two exchanges between the Web browser and the website, a first of the two exchanges is made via a public field of the Web browser and a second of the two exchanges is made via a private field of the Web browser.