ATG Store and ATG Home have separate catalogs that share some categories. On each site, the store.war/navigation/gadgets/catalog.jsp gadget (which is included by the <crs:pageContainer> tag) creates a menu bar. The menu bar, which is displayed at the top of most pages, lists the top-level categories of the site. For example, on the ATG Home site, the top-level categories are Gift Shop, Tables, Seating, Storage and Display, Home Accents, and New Items:

Hovering the cursor over an entry displays a menu of its subcategories, and a list of featured products in the category: