System layer
The system layer provides a complete object-oriented interface to the underlying network subsystem. This interface is designed for application programmers with requirements that cannot be met by existing dialog styles and for implementers of new dialog styles.
The interface to the system layer is specific to the network protocol (or other subsystem) being used, but is designed to be portable across operating system implementations of the network protocol. The implementation of the system layer is specific to the underlying network protocol.
The role of the system layer is to handle some of the tedious work of accessing a network interface (preparing records, converting types, and detecting errors) and to provide a more natural object-oriented view of the concepts of the network protocol.
Last modified date: 01/29/2015