ISO's OSI Layered Model - Session Layer

The Session Layer controls the dialogues (connections) between computers. It establishes, manages and terminates the connections between the local and remote application.
Synchronization of communicating applications comes into play,
The Session Layer is commonly implemented explicitly in application environments that use remote procedure (RPC) calls. RPC may be built on either TCP or UDP. Login sessions uses TCP whereas NFS and broadcast use UDP.

The session layer examples include SQL, RPC, XWindows, etc.

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