- ajax_example_advanced_commands_remove_callback in modules/
examples/ ajax_example/ ajax_example_advanced.inc  - Callback for 'remove'.
 - ajax_forms_test_advanced_commands_remove_callback in core/
modules/ simpletest/ tests/ ajax_forms_test.module  - Ajax callback for 'remove'.
 - file_ajax_upload in core/
modules/ file/ file.module  - Ajax callback: Processes file uploads and deletions.
 - filter_format_editor_dialog_save in core/
modules/ filter/ filter.pages.inc  - Form AJAX callback. Sends the save editor AJAX command and closes the dialog.
 - layout_ajax_form_open_dialog in core/
modules/ layout/ layout.admin.inc  - AJAX handler that opens a form in a dialog.
 - layout_ajax_form_save_dialog in core/
modules/ layout/ layout.admin.inc  - AJAX handler that saves a form in a dialog and updates the underlying form.
 - layout_ajax_form_save_title_dialog in core/
modules/ layout/ layout.admin.inc  - AJAX handler that updates the title.
 - layout_block_configure_ajax_update in core/
modules/ layout/ layout.admin.inc  - AJAX callback to update the underlying layout form after updating a block.
 - layout_block_disable_page in core/
modules/ layout/ layout.admin.inc  - Menu callback; Set a block as disabled.
 - layout_block_remove_page in core/
modules/ layout/ layout.admin.inc  - Menu callback; Remove a block from a layout.
 - layout_flexible_template_delete_row in core/
modules/ layout/ layout.flexible.inc  - Menu callback to delete a row from a flexible template.
 - layout_flexible_template_edit_row_ajax in core/
modules/ layout/ layout.flexible.inc  - AJAX callback on the submit button for editing a layout row.
 - layout_settings_form_path_ajax in core/
modules/ layout/ layout.admin.inc  - AJAX handler for layout_settings_form().