Zen Cart plugin

A Zen Cart plugin is a plugin for WordPress.

zen_register_admin_page

zen_register_admin_page ($page_key, $language_key, $main_page, $page_params, $menu_key, $display_on_menu, $sort_order);

Where:

page_key is a unique text id
language _key is the name of the define for the page name that would previous have been used in the box files (for compatibility with existing language packs)
main_page is the define starting FILENAME_ used in the box file and code to direct to the admin page
page_params are whatever parameters are needed for the page (generally relevant only to configuration and modules pages
menu_key is a foreign key for the admin_menus table
display_on_menu is a char with value "Y" or "N" depending on whether it's a page visible on the admin menu, or a subpage called by another page
sort_order is a numeric value indicating how high up the menu the entry would appear, a high value sinks it down

Source: