DO


  • Support computer-to-computer communication in standard
  • Client and server communicate 
  • An applications-layer protocol.
  • Establish a connection
  • Searching a database 
  • Ask the records
  • Retrieve the records 

    References:
    The ANSI/NISO Z39.50 Protocol: Information Retrieval in the Information Infrastructure. http://www.cni.org/pub/NISO/docs/Z39.50-brochure/50.brochure.part02.html