Source : Free On-Line Dictionary of Computing

session layer
     
         The third highest {protocol layer} (layer 5) in the {OSI}
        seven layer model.  The session layer uses the {transport
        layer} to establish a {connection} between processes on
        different {hosts}.  It handles {security} and creation of the
        session.  It is used by the {presentation layer}.
     
        Documents: {ITU} Rec. X.225 ({ISO} 8327), ITU Rec. X.215 (ISO
        8326).
     
        [Examples?]
     
        (1997-12-07)