[Gmsh] questions on the .msh-file

[Martin Huber]

Hello

I'm currently working on including meshes, consisting only of 3-node
triangles, from gmsh into a BEM-code. So I have some questions on the
msh-file that I couldn't find in the manual:
- In the element section there are not only 3-node triangles, but also
some nodes and some edges (but as far as I noticed not all of them). Are
these special nodes/edges and why are they in the elements section?
- Is it possible to get information about neighbourhood of the
triangles, e.g. an additional array that tells, which triangle is beside
the edge number i of the current triangle?

Thanks for your answer.

Martin Huber