session layer

The session layer is level five of the seven level OSI model. It responds to service requests from the presentation layer and issues service requests to the transport layer.The Session layer provides the mechanism for managing the dialogue between end-user application processes. It provides for either full duplex or half-duplex operation and establishes checkpointing, adjournment, termination, and restart procedures.The Session layer is typically completely unused, but it does have a few places where it is useful. The idea is to allow information on different streams, perhaps originating from different sources, to be properly combined. In particular, it deals with synchronization issues, and ensuring nobody ever sees inconsistent versions of data, and similar things.
See more at Wikipedia.org...

See Open Systems Interconnection--Reference Model.

<networking> 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)