Remove the specified object from the display list. If the same object was placed multiple times at the specified depth1 only the last copy is removed. When only a depth is specified, the last object placed at that depth is removed from the list. Note that since version 3 it is possible to use the PlaceObject2 in order to replace an object at a given depth without having to remove it first.
1. It is illegal, yet possible, to place more than one object at the same depth.
Recently, Linden Lab changed the way they create names for new avatars for Second Life. This has caused issues with SLiteChat but a simple work around can resolve this problem for you.