wp_register_sidebar_widget()
Function: Register an instance of a widget.
Source: wp-includes/widgets.php:341
Function: Register an instance of a widget.
Source: wp-includes/widgets.php:341
Function: Remove widget from sidebar.
Source: wp-includes/widgets.php:440
Function: Registers widget control callback for customizing options.
Source: wp-includes/widgets.php:480
Filter Hook: Filters the returned trackback URL.
Source: wp-includes/comment-template.php:1140