A KC user role that refers to a type of KC user who acts on a document that has arrived in their action list via an Action Request for a document that has been ad-hoc routed to them for 'Acknowledgment' or 'FYI.' See also Ad Hoc Recipients. A user acting on a document in his/her Action List, and who has therefore received an Action Request for the document. A user who received and provided responsible action that is based on the Action Request of document(s) in his/her Action List.