Back in February, there was a question asked in the WorkflowFAQ forum about how to find exactly who responded to a notification:
If a notification for one user was closed by another user through access to the first user’s worklist, the name of the second user, who actually took the action, is displayed as the responder.
I am only able to find the Original Recipeint username in the wf_notifications table.
But where will the details of the Actual Responder name displayed in the notification be stored.
The quick answer is that the PROXY_ROLE column in WF_COMMENTS is where the variable WF_ENGINE.context_proxy gets stored once the notification is closed.