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undifined hookDisplay method style working

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I was looking for a way to display the displayNav3 in base prestashop theme in 2 different hooks, the first one for the cart and the second one for the customer sign in.

After a few hours, looking for a solution,  i choose to override Ps_Shoppingcart in the way you can see below

class Ps_ShoppingcartOverride extends Ps_Shoppingcart
    public function __construct()

    public function install()
            parent::install() &&

here is my header.tpl file

<div class="secondaryNav">
    <div class="secondaryNav-content">
        <div class="secondaryNav-img">
            <a href="{$urls.base_url}">
                {*            <img src="{$shop.logo}" alt="{$shop.name}">*}
                <img src="https://img/img.png" alt="{$shop.name}">
                <!--todo dell image en dure-->
        {hook h='displayTop' mod='ps_searchbar'}
        {hook h='displayHeaderCart'}

It's working (i can move displayHeaderCart anywhere in a .tpl file), but i don't understand why it's work,there is absolutly nowhere a declaration of hookDisplayHeaderCart.

i would like to know how it's work. i found nothing about this subject.

Ty For help !

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