Perhaps, but this is a big deal, and I hope that you have every reason for this (I could not come up with).
In any case, since the state provider does not have the default status "get status for all users", you must implement it yourself. What you are probably using right now as a session state provider is System.Web.SessionState.InProcSessionStateStore, which comes from SessionStateStoreProviderBase; what you need to do is implement your own session state store provider, which will also be inferred from SessionStateStoreProviderBase.
Link: http://msdn.microsoft.com/en-us/library/ms178589 (v = vs .100) .aspx
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