What Is a Session?

Before transaction programs can communicate with each other, their LUs must be connected in a mutual relationship called a session. A session connects two LUs, so it is called an LU-LU session. A Session between Two LUs illustrates this communication relationship. Multiple concurrent sessions between the same two LUs are called parallel LU-LU sessions.

Sessions act as conduits that manage the movement of data between a pair of LUs in an SNA network. Specifically, sessions deal with things such as the quantity of data transmitted, data security, network routing, and traffic congestion.