[Andy]

That function operates on an edgelist and returns all edges that reference a given surface.

You can create a list of edges from an object with:

Prototype List *ac_object_get_edges(ACObject *ob)

or use:

Prototype List *ac_selection_get_edges(Boolean wholesurfaces)

Note that AC3D objects don't maintain edge structures - these functions create temporary edge structures for use in some of AC3D's other functions. Free an edgelist with:

Prototype void ac_edgelist_free(List **e)

Andy