Communications/Transactions Guide and Reference


Communications Subsystem design

The Communications Subsystem is the set of IBM Smalltalk classes that support communications over the internet, local area network (LAN) or via a 3270 emulator. VisualAge exploits the Communications Subsystem to provide easy to use parts for application construction.

The Communications Subsystem is divided into three layers:

Each layer exploits the services provided by the next lower-level layer.

Dialog Layer
System Layer
System Interface Layer

The layered design gives you the flexibility to implement applications that use network-protocol-independent application logic. The Communications/Transactions feature supports the following communication protocols by creating a specialization of this subsystem:


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