[fluxus] pdata storage question

[Alex]

I'm wondering what exactly pdata stores.
I want to deform an object, and i want to write an stl file based on this.
basically I need a list of triangles and normals each triangle.
so is pdata stored like:
pt1
pt2
pt3
pt4

where the points define triangle pt1 pt2 pt3 and triangle pt2 pt3 pt4?
 Am i completely off here?
What about the normals? it doesn't really make sense for me that there
are normals for each vertex, to find the actual normal for the
triangle do you just add the normals at each vertex and then
normalise?
thanks,
-Alex