Caching data within session allowing for cache dependencies?

I have a requirement whereby I need to store data within
Session however I
need to associate the data with a key if the key changes I
need the data to
be removed. In essence I need to use cache with cache key
dependencies but
the storage must be Session.



How this would work (if at all across) across a web farm I
haven't even
started about that. Anybody got any suggestions?



Regards

Robert.




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