LU 6.2 API Application Programmer's Reference Guide (30294-90008)

Chapter 1 25

The SNA Network and LU 6.2 API

Hewlett-Packard’s LU 6.2 API

APPC allows two programs to communicate, and LU 6.2 deﬁnes the

actions or verbs that each program may execute in an APPC

application.

The Application Program Interface (API) consists of a set of intrinsics.

These intrinsics are predeﬁned subroutines that implement the LU 6.2

architected verbs. They can be called from within application programs.

Hewlett-Packard’s LU 6.2 API implements the set of mapped

conversation verbs deﬁned for LU 6.2. SNA deﬁnes two types of

conversations between communicating programs: basic

conversations and mapped conversations.

In a basic conversation (one that uses basic conversation verbs), the

application must perform some error recovery and data formatting

activities.

In a mapped conversation (one that uses mapped conversation

verbs), the application focuses only on data handling and relies on an

underlying program or system to provide error recovery and data

formatting. Hewlett-Packard's LU 6.2 API supports mapped

conversations.

Supported Languages

The programming languages supported by LU 6.2 API intrinsics are

listed below, for MPE V and MPE XL systems:

IBM’s CICS

Hewlett-Packard’s LU 6.2 API intrinsics are often used to write

applications that communicate with IBM LU 6.2 applications running

under the Customer Information Control System (CICS). CICS is

a subsystem that enables data transmitted over communication lines to

be processed by host application programs. These host application

programs can be written in COBOL, PL/1, or Assembler. Appendix B

contains a sample CICS program and an HP 3000 program that

communicates with it using LU 6.2 API.

MPE V: MPE XL:

COBOL II COBOL II

Pascal Pascal

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