Do you mean what is the UN doing? Any peacekeeping force is about two things--deterrence and reassurance. You're there to deter the bad guys by being present, by being in their face, and by actually taking them on when you need to. You're there to reassure the civilian population. All indications are, from the reporting that we read from the UN from our chief of staff who's present on the ground, that in 95% of the country they're achieving success, but there are some patches, in Port-au-Prince in particular, where it's particularly difficult.
On June 7th, 2006. See this statement in context.