HP-UX TN3270 Administration Guide

Understanding TN3270
What Is TN3270?
Chapter 1 17
What Is TN3270?
TN3270 is a software product that enables HP-UX computer terminals to
connect over a TCP/IP network and emulate 3270 terminals connected to
a host computer. Two versions of the TN3270 program, with different
user interfaces, are available: a character-based version that runs on
standard text terminals and a Motif graphical user interface.
The TN3270 program can connect directly to a host computer that
supports TN3270 access over TCP/IP or to a communications product
that provides the TN Server function. The standard SNAplus2 product
provides the TN Server function; therefore, the TN3270 programs can
access a host over the SNA communications links provided by SNAplus2.
You can configure the TN3270 program to grant different user
permissions for the following options:
• Controlling TN3270 sessions
• Customizing TN3270 emulation features such as key mappings and
display attributes
• Transferring files between the local and host computers
• Viewing a chart of host response times
• Running HLLAPI applications
Each user's copy of the TN3270 program can access up to ten TN3270
sessions to the same host or to different hosts.
For information about using the TN3270 software, refer to the HP-UX
TN3270 Users Guide.
TN3270 Features
TN3270 provides the following additional features:
HLLAPI support
The high level language application program interface
(HLLAPI) enables you to develop application programs
that communicate with the TN3270 program to
perform tasks, such as entering data and searching the
screen for specific messages, that are normally done by