6 uses of REGIONS_VISIBLE in Drupal 7

block_admin_configure in modules/block/block.admin.inc

Form constructor for the block configuration form.

block_admin_display_form in modules/block/block.admin.inc

Form constructor for the main block administration form.

block_page_build in modules/block/block.module

Implements hook_page_build().

block_theme_initialize in modules/block/block.module

Assigns an initial, default set of blocks for a theme.

dashboard_admin_blocks in modules/dashboard/dashboard.module

Page callback: Builds the page for administering dashboard blocks.

system_default_region in modules/system/system.module

Get the name of the default region for a given theme.