See 
PublishedAPI for packages intended to be used by Plugin and Contrib authors, or 
browse all packages.
See also 
Developing plugins, 
Developer's Bible, 
Technical Overview
service class to render the %WEBCOMPONENT macro
 render($params) → $html 
 getWebComponent($web, $component, $multiple) → $html 
search path
 
-  search WebTheComponent in current web
-  search SiteTheComponent in %USERWEB%
-  search SiteTheComponent in System
-  search WebTheComponent in System web
(like: 
TheComponent = 
SideBar)