Function: Registers all of the default ClassicPress widgets on startup.

Function: Process RSS feed widget data and optionally retrieve feed items.

Function: Retrieve default registered sidebars list.

Function: Convert the widget settings from single to multi-widget format.

Function: Output an arbitrary widget as a template tag.

Function: Retrieves the widget ID base value.

Function: Handle sidebars config after theme change

Function: Look for “lost” widgets, this has to run at least on each theme change.