Purpose of this information: This document describes the syntax and semantics of a set of high-level application functions that you can use to program your own applications in a TCP⁄IP environment. These functions provide support for application facilities, such as user authentication, distributed databases, distributed processing, network management, and device sharing. The information in this document supports both IPv6 and IPv4. Unless explicitly noted, information describes IPv4 networking protocol. IPv6 support is qualified within the text.

Who should read this information: This document is intended for use by an experienced programmer familiar with the IBM® z/OS® operating system and commands, and with the TCP⁄IP protocols.

This document is written for programmers interested in high-level application functions that can be used to program applications in a TCP/IP environment. These functions involve user authentication, distributed databases, distributed processing, network management, and device sharing.

Before using this document, you should be familiar with the MVS™ operating system and the IBM Time Sharing Option (TSO).

Depending on the design and function of your application, you should be familiar with the C programming language.

In addition, z/OS Communications Server and any required programming products should already be installed and customized for your network.