[Guy Harris <guy@xxxxxxxxxx>]

> I haven't looked at the packet window routines to see
> how they handle their tvbuffs, that is, do they make
> their own, or do they use the same one that the main GUI
> is using.

The packet window routines do

  DataPtr->pd = g_malloc(DataPtr->frame->cap_len);
  memcpy(DataPtr->pd, cfile.pd, DataPtr->frame->cap_len);
  DataPtr->protocol_tree = proto_tree_create_root();
  proto_tree_is_visible = TRUE;
  DataPtr->edt = epan_dissect_new(&DataPtr->pseudo_header, DataPtr->pd, DataPtr->frame,
		DataPtr->protocol_tree);

so they don't directly create tvbuffs, but it creates them indirectly -
"epan_dissect_new()" does it for them.