Companion item UI
Companion item UI, basically a container window with an encumbrance bar and Profit label. Whether or not this is available from the dialogue menu seems to depend on the local short "Companion" in the NPC's script being set to 1.
(RM-683 from redmine: created on 2013-03-30 by scrawl ., , closed on 2013-03-31 by scrawl .)