lan_look_stream::get_idf_info

Source: stream/pad/Look/Lan/lan_look_stream__get_idf_info.pro

 lan_look_stream::get_idf_info
        Get IDF info (sort of) for a lan look-direction stream.
 
 Usage:
        strref -> get_idf_info(<keys>)

 Keywords:
        sectors         Return how many sectors the head has.
        description     Return a brief description of the head.
        erange, energy, geometry, location      Dummy keys, needed by
                                                some dataset methods.

 History:
        Original: 6/3/00; SJT
        Added _extra key to swallow unused items: 24/7/01; SJT