To create a triangulation you must either
buildmesh
Triangulate
(Macintosh only).
In integrated environments, once created, triangulations can be displayed, stored on disk in Gfem format or in text format or even a zoom of its graphic display can be stored in Postscript format (to include it in a TeX file for example).
Gfem stores for each vertex its number and boundary identification number and for each triangle its number and region identification number. Edges number are not stored, but can be recovered by program if needed.