You can make a tree styurure like this :
Home (here Accueil) : This is where all start ;) the root of the shop
Processing page (here Détail magasin) : here will be the plugin for the processing page, it's also the page user during the installation of the plugin or the number you define in typoscript (plugin.metaoscommerce.page_cible = 4)
My account (here Mon compte) : page displaying the account of the customer
Shopping cart (here Panier) : page displaying the cart of the front end visitor.
Other pages (here Catégorie 1 & 2) : page displaying a particular product categorie.