Errors, 404 errors: Controlling what the user sees

The following areas control the what the user sees when an error or 404 not found error occurs:

Admin.EditableContent.Name.errorpage.general | errorpage.general
Admin.EditableContent.Name.errorpage.statuscode.404 | errorpage.statuscode.404
Admin.EditableContent.Name.errorpage.statuscode.default | errorpage.statuscode.default
Error Page | ErrorPage.TopArea