Wireshark · Ethereal-dev: [Ethereal-dev] newbie don't understand ethereal dissector calls

["bunty " <bunty123_4@xxxxxxxxxxxxxx>]

 
Hello,
    I want to know what is functioning of following calls in packet-ip.h
data_handle = find_dissector("data");
ip_handle = find_dissector("myip");
  Also when to use create_dissector_handle. I am trying to add prtocol in between Ethernet and IP layer.
regards,
bunty