IBM 3174 Reference Guide

Establishing Multipie Host Connections
the characters would be adjusted after you pressed Enter, like this:
GETINDCB.BUFA NEW RECORD
Whenyou use Enhanced Null/Space Processing, blanks never disappear, whether
or not they are generated using the cursor movement keys.
Enhanced Null/Space Processing is also useful during insert mode. Normally, you
must delete blank spaces (by using ERASE EOFor delete) between the last graphic
character and the end of the field before inserting characters. When you use this
function, you can simply insert a character without deleting spaces. Inthe
following example, '#' marks the end of the line:
The rn in Spain falls mainly on the plain. #
If you have accessed Enhanced Null/Space Processing, youcan simply insert the
"ai" in "rain" without deleting the spaces between "plain" and
For a more detailed description of Enhanced Null/Space Processing, see the 3174
Functional Description.
Establishing Muitipie Host Connections
Each time you connect your terminal to a host, you establish a session with that
host. The IBM 3174 term for session is logical terminal (LT). The 3174 allows you
to have multiple sessions. From your terminal you can initiate up to five separate
host sessions. This is known as Multipie Logical Terminal (MLT) support. You can
connect to an IBM or ASCII host in each session.
Your terminal screen and keyboard can only show one session at a time; this
session is called the active session. The other sessions are maintained by the
3174 and are called background sessions.
You can access different sessions by using the change-screen sequence.
Skipping and Restoring Sessions (LTs)
The following keys are available in extension (or Extended Select) mode:
• The Skip This LT key
• The Restore Ail Skipped LTs key.
You can mark an LT as skipped by pressing the Skip This LTkey, thereby removing
it from the change-screen sequence list. Pressing the Skip This LT key causes a
change-screen sequence to the next LT.
Once you mark an LT as skipped, it is skipped on subsequent change-screen
sequences until you press the Restore AiiSkipped LTs key. See Figure 1-2on
page 1-8 through Figure 1-4 on page 1-9 for the location of these keys.
Note: On ASCII terminals, skipped LTs are restored when the terminal is turned
off and then back on.
Chapter 1. GettingStarted 1-3

IBM 3174 Specifications

General

Brand	IBM
Model	3174
Category	Controller
Language	English