About The LUA Guide

The Microsoft SNA Server LUA Programmer's Guide explains how to develop C-language applications that use the conventional Logical Unit Application programming interface (LUA) to exchange data in a Systems Network Architecture (SNA) environment.

This implementation of LUA is compatible with the Request Unit Interface (RUI) and the Session Level Interface (SLI) of LUA for the Microsoft® Windows NT® and Microsoft® Windows® 95 operating systems, the Windows graphical environment, and the IBM Extended Services for OS/2 version 1.0.

This guide provides conceptual information and detailed reference information. Before reading it, you should be familiar with:

General concepts for the communications software you have installed. (Refer to your product documentation for information.)
SNA concepts.
Microsoft® C version 5.1 or later.
One of the following operating environments:
Microsoft Windows NT

Microsoft Windows 95

Microsoft Windows version 3.0 or later

IBM Extended Services for OS/2 version 1.0

The guide covers the following topics:

Concepts: Introduces the fundamental concepts of LUA and includes information on the SNA concepts involved in LUA.
Writing LUA Applications: Provides general information needed for writing LUA applications. This section also includes information on compiling and linking an LUA application.
LUA RUI Verbs: Describes each Request Unit Interface (RUI) verb.
LUA SLI Verbs: Describes each Session Level Interface (SLI) verb and routine.
Extensions for the Windows Environment: Describes extensions to Windows LUA.
SNA Server Enhancement to the Windows Environment: Describes the API extension to Windows LUA that converts primary and secondary return codes in the verb control block (VCB) to a printable string.
Verb Control Blocks: Defines the structure of individual Windows LUA VCBs, including the common structures and the command-specific structures of LUA VCBs.
Common Return Codes: Provides a listing of all return codes in hexadecimal order.
LUA Code Samples in the SDK: Describes the LUA code samples in the Microsoft® SNA Server SDK.