Post Office Protocol
     
         (POP) A protocol designed to allow
        single user computers to retrieve electronic mail from a POP
        server.  The POP server might be a computer with a permanent
        Internet connection whereas its clients might only connect
        to it occasionally, e.g. by modem.
     
        There are (in 1994) three versions: POP, POP2, and POP3.
        Later versions are NOT compatible with earlier ones.
     
        [Details?]
     
        (1997-03-06)