All basic tips are pooled and shared.
If you tip the room steward extra, s/he is supposed to put it into the pool with the other tips. Do they really do it? I don't know.
SS Norway (12 times) '85 - '97; Radiance OS 06/01; Island Princess 11/04, Grand Princess 11/04/05, Golden Princess 7/21/06, Golden Princess 2/24/07, Explorer of the Seas 12/23/07, Island Princess 11/15/08