Diff. btw. xxContainerRenderer.renderShowHeader() and renderPortletHeader()

Hi,
Can anyone explain the diff. betw. the renderShowHeader() and renderPortletHeader() methods of the xxxContainerRenderer Class ?
The the only diff I see is that the renderShowHeader() has a PrintWriter parameter indicating that it prints it out itself AND its only for the SHOW mode, - and the renderPortletHeader() does not contain the printWriter parameter indicating that I need to print it out and that it picks up the MODE the request is in before printing the header ?
Is there any other subtle differences betw. the two, that would be helpful to know ?
thanks
-Ananth

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