Using SNA Sessions

Before an LUA application program can communicate with a partner host application program, the respective LUs must be connected in a mutual relationship called a session. An SNA session is a logical connection that enables two network addressable units (NAUs) to communicate with each other; an LU is one kind of NAU. Because the session connects two LUs, it is called an LU-LU session. LU-LU sessions enable end users to exchange data.

A session manages how data moves between a pair of LUs in an SNA network. Therefore, sessions are concerned with such things as the quantity of data being transmitted, data security, network routing, data loss, and traffic congestion. Session characteristics are determined by the SNA BIND command originating from the primary LU, when the secondary LU accepts the BIND command.