IDCCEN ( enty1, enty2, idty, entys, nitems, ifail )
===================================================

  Identify common connected entities

    Can be called from the GO.

Receives:
  KI_tag_entity            *enty1          --- first entity to look in
 <KI_tag_entity>           *enty2          --- second entity to look in
  KI_cod_idty              *idty           --- type of connection

Returns:
  KI_tag_list_entity       *entys          --- Returned list of entities
 <KI_int_nitems>           *nitems         --- Number of returned entities
  KI_cod_error             *ifail          --- failure indicator

Specific errors:
  KI_general_body           General body
  KI_not_in_same_body       entities not owned by the same body
  KI_wrong_entity           wrong entity type(s)

Description:
  Identify and return a list of entities connected to the received entity or
  entities and with the specified connection.

  All connections are found via the topology of the part; e.g. to identify all
  curves common to two surfaces, all the faces associated with the first surface
  are compared with all the faces associated with the second surface to find all
  common edges and hence all common curves.

  The supported connection types are:-

  IDTYCS:        Find common curves from two surfaces
      Both surfaces must be owned by topology in the same part
      enty1, enty2 = surfaces
      entys = list of curves  (May contain duplicate entries)

  IDTYSC:        Find pairs of surfaces given common curve
      enty1 = curve
      entys = list of pairs of surfaces

  IDTYEF:        Find edges common to two faces
      Both faces must be owned by the same part
      enty1, enty2 = faces
      entys = list of edges

  This function is not supported for entities belonging to general
  bodies.