Can you list some portlet API objects ?

Servets ========================== Portlets
=========================================================
ServletContext --------------------- PortletContext

ServletConfig --------------------- PortletConfig


ServletRequest --------------------- PortletRequest

ServletResponse --------------------- PortletResponse

RequestDispatcher --------------------- PortletRequestDispatcher
(include + forward) (include + forward )

HttpSession --------------------- PortletSession


URL --------------------- PortletURL

NA --------------------- RenderRequest

NA --------------------- RenderResponse