How can I know the request is come from the link in header in the filter?

I am using the tile for layout management and each page has a header, menu, and content body. I want to do something at the filter If the request is come from the commandlinks in the header and menu.
How can I know the request is come from the link in header in the filter?

Basically all you have to go on is the request data. Examine the encode/decode requirements for commandLink; you may be able to determine from the request attributes which commandLink has been invoked.

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How can I know the request is come from the link in header in the filter?

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