meta_form()
Function: Prints the form in the Custom Fields meta box.
Source: wp-admin/includes/template.php:690
postmeta_form_keys
Filter Hook: Filters values for the meta key dropdown in the Custom Fields meta box.
Source: wp-admin/includes/template.php:705
postmeta_form_limit
Filter Hook: Filters the number of custom fields to retrieve for the drop-down in the Custom Fields meta box.
Source: wp-admin/includes/template.php:716