Irrlicht Engine

Hello again all,
I've managed to get a decent program that load my level but now I have another question-
I'm working with the concept of collision detection, and I can get it to compile but it doesn't work. I think I might be looking at the code wrong here.

if (q3levelmesh)
q3node = smgr->addOctTreeSceneNode(q3levelmesh->getMesh(0));

This is from the collision tutorial...
I don't really understand what is in the parentheticals after AddOctTreeSceneNode. is that the name of the node, or something? I'm learning this code as I go and I'm missing a lot of fundamentals, so if this sounds too stupid don't flame me too crispy

Also does Irrlicht not support a 2 sided face? There are a few places where I used a face that was visible on both sides, and I found that it was invisible from one side! It's not a major issue really, I can easily model around that limitation but I just need a confirmation of that or whether I'm just doing something wrong.

Just look some lines up where you can find the animated scene node which has the name.
You can set the material flag BackfaceCulling to false to get two-sided rendering.

this means get the 1st mesh (#0) from the q3levelmesh mesh...
It's done this way because animated meshes have usually more than 1 mesh...