6 calls to batch_set()

install_tasks in drupal-6.x/install.php
Tasks performed after the database is initialized.
locale_languages_predefined_form_submit in drupal-6.x/includes/locale.inc
Process the language addition form submission.
locale_system_update in drupal-6.x/modules/locale/locale.module
Imports translations when new modules or themes are installed or enabled.
node_access_rebuild in drupal-6.x/modules/node/node.module
Rebuild the node access database. This is occasionally needed by modules that make system-wide changes to access levels.
node_mass_update in drupal-6.x/modules/node/node.admin.inc
Make mass update of nodes, changing all nodes in the $nodes array to update them with the field values in $updates.
update_batch in drupal-6.x/update.php