wp_dashboard_setup()

function wp_dashboard_setup() {
	global $wp_registered_widgets, $wp_registered_widget_controls, $wp_dashboard_control_callbacks;
	$wp_dashboard_control_callbacks = array();
	$screen = get_current_screen();

	/* Register Widgets and Controls */

	$response = wp_check_browser_version();

	if ( $response && $response['upgrade'] ) {
		add_filter( 'postbox_classes_dashboard_dashboard_browser_nag', 'dashboard_browser_nag_class' );
		if ( $response['insecure'] )
			wp_add_dashboard_widget( 'dashboard_browser_nag', __( 'You are using an insecure browser!' ), 'wp_dashboard_browser_nag' );
		else
			wp_add_dashboard_widget( 'dashboard_browser_nag', __( 'Your browser is out of date!' ), 'wp_dashboard_browser_nag' );
	}

	// Right Now
	if ( is_blog_admin() && current_user_can('edit_posts') )
		wp_add_dashboard_widget( 'dashboard_right_now', __( 'At a Glance' ), 'wp_dashboard_right_now' );

	if ( is_network_admin() )
		wp_add_dashboard_widget( 'network_dashboard_right_now', __( 'Right Now' ), 'wp_network_dashboard_right_now' );

	// Activity Widget
	if ( is_blog_admin() ) {
		wp_add_dashboard_widget( 'dashboard_activity', __( 'Activity' ), 'wp_dashboard_site_activity' );
	}

	// QuickPress Widget
	if ( is_blog_admin() && current_user_can( get_post_type_object( 'post' )->cap->create_posts ) ) {
		$quick_draft_title = sprintf( '<span class="hide-if-no-js">%1$s</span> <span class="hide-if-js">%2$s</span>', __( 'Quick Draft' ), __( 'Your Recent Drafts' ) );
		wp_add_dashboard_widget( 'dashboard_quick_press', $quick_draft_title, 'wp_dashboard_quick_press' );
	}

	// ClassicPress News
	wp_add_dashboard_widget( 'dashboard_primary', __( 'ClassicPress News' ), 'wp_dashboard_events_news' );

	// ClassicPress Petitions
	wp_add_dashboard_widget( 'dashboard_petitions', __( 'ClassicPress Petitions' ), 'cp_dashboard_petitions' );

	if ( is_network_admin() ) {

		/**
		 * Fires after core widgets for the Network Admin dashboard have been registered.
		 *
		 * @since WP-3.1.0
		 */
		do_action( 'wp_network_dashboard_setup' );

		/**
		 * Filters the list of widgets to load for the Network Admin dashboard.
		 *
		 * @since WP-3.1.0
		 *
		 * @param array $dashboard_widgets An array of dashboard widgets.
		 */
		$dashboard_widgets = apply_filters( 'wp_network_dashboard_widgets', array() );
	} elseif ( is_user_admin() ) {

		/**
		 * Fires after core widgets for the User Admin dashboard have been registered.
		 *
		 * @since WP-3.1.0
		 */
		do_action( 'wp_user_dashboard_setup' );

		/**
		 * Filters the list of widgets to load for the User Admin dashboard.
		 *
		 * @since WP-3.1.0
		 *
		 * @param array $dashboard_widgets An array of dashboard widgets.
		 */
		$dashboard_widgets = apply_filters( 'wp_user_dashboard_widgets', array() );
	} else {

		/**
		 * Fires after core widgets for the admin dashboard have been registered.
		 *
		 * @since WP-2.5.0
		 */
		do_action( 'wp_dashboard_setup' );

		/**
		 * Filters the list of widgets to load for the admin dashboard.
		 *
		 * @since WP-2.5.0
		 *
		 * @param array $dashboard_widgets An array of dashboard widgets.
		 */
		$dashboard_widgets = apply_filters( 'wp_dashboard_widgets', array() );
	}

	foreach ( $dashboard_widgets as $widget_id ) {
		$name = empty( $wp_registered_widgets[$widget_id]['all_link'] ) ? $wp_registered_widgets[$widget_id]['name'] : $wp_registered_widgets[$widget_id]['name'] . " <a href='{$wp_registered_widgets[$widget_id]['all_link']}' class='edit-box open-box'>" . __('View all') . '</a>';
		wp_add_dashboard_widget( $widget_id, $name, $wp_registered_widgets[$widget_id]['callback'], $wp_registered_widget_controls[$widget_id]['callback'] );
	}

	if ( 'POST' == $_SERVER['REQUEST_METHOD'] && isset($_POST['widget_id']) ) {
		check_admin_referer( 'edit-dashboard-widget_' . $_POST['widget_id'], 'dashboard-widget-nonce' );
		ob_start(); // hack - but the same hack wp-admin/widgets.php uses
		wp_dashboard_trigger_widget_control( $_POST['widget_id'] );
		ob_end_clean();
		wp_redirect( remove_query_arg( 'edit' ) );
		exit;
	}

	/** This action is documented in wp-admin/edit-form-advanced.php */
	do_action( 'do_meta_boxes', $screen->id, 'normal', '' );

	/** This action is documented in wp-admin/edit-form-advanced.php */
	do_action( 'do_meta_boxes', $screen->id, 'side', '' );
}