9 uses of MENU_TYPE_TAB

admin_menu in modules/admin/admin.module
Implementation of hook_menu
advise_menu in modules/advise/advise.module
blocks_menu in modules/blocks/blocks.module
comments_menu in modules/comments/comments.module
content_menu in modules/content/content.module
fp_display_page in includes/theme.inc
Output the contents of the $page variable to the screen. $page is an array containing details about the page, as well as its original menu item (router_item) definition.
hook_menu in includes/hook.api.php
Allows modules to specify valid URLs in FlightPath, and define what function to call when the user visits that URL.
student_search_menu in modules/student_search/student_search.module
system_menu in modules/system/system.module