JPF and backing file

I have just started using BEA portal. JPF has controller that handles all the action processings. Backing file has callback handlers to perform the same. Is the backing file concept prior to JPF's were introduced or they still go hand in hand? When does a JPF based portlet need to have a backing file as well?
Any clarifications will be apprecieted.
Thanks
-SDD

No, you don't need backing files to write portlets. The primary purpose
of backing files is to let you interact with the portal's aggregation
framework directly. You can think of backing files as an intermediary
between the framework and your JPF.
Subbu
Shiv Dhondiyal wrote:
I have just started using BEA portal. JPF has controller that handles all the action processings. Backing file has callback handlers to perform the same. Is the backing file concept prior to JPF's were introduced or they still go hand in hand? When does a JPF based portlet need to have a backing file as well?
Any clarifications will be apprecieted.
Thanks
-SDD

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(I apologize if this post is showing up twice - I tried posting with
google groups but it doesn't appear at forums.bea.com, so I wanted to
post again using xnews to make sure it shows up.)
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