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If the Form or Link is enclosed by the Zone itself, then the zone parameter may be set to the special value ^. The carat is evaluated, on the client side, by searching up form the form or link element for the first enclosing element with the t-zone CSS class. In this way, the client-side coordination can occur without having to know what the specific client-side id of the Zone is. Because of this, in many cases, it is not no longer necessary to specify the Zone's id parameter.