PeopleUpdate uses secondary pages for a highly configurable search interface for updating certain types of data in Active Directory, specifically attribute data stored by distinguished name. This type of attribute--which includes Manager, Assistant, Secretary, Groups, Group Members, etc--requires a lookup to find another Active Directory object to use to populate the attribute value. These secondary pages are rendered in the Search Console as pop-up pages from the PeopleUpdate Edit page.
You can associate secondary pages with a page layout template to quickly and easily lay out a page. Secondary pages also have their own configuration information that can override the page layout template's configuration values through inheritance.
You can specify which secondary pages to use to search and display summary information for an LDAP attribute on a tab when editing the attribute. Refer to the Attributes topic for more information about relating attributes to secondary pages