IBM 3270 Manual page 37

The Work Station Control and Entry Assist side
looks like this:
Use this side if your host computer'has Entry
Assist. The IBM 3270 Information Display
System: Entry Assist RPQ
(8Kl147)
User's Guide,
GA23-0049, explains how to use the Entry Assist
keys.
The Work Station Control, Entry Assis,t, and
X.25 Network Communications side looks like
this:
Use this side if your host computer has Entry
Assist and is connected to an X.25 network. The
IBM 3270 Information Display System: X.25
Operation, GA23-0204, describes how to use the
X.25 keys.
3-8 Book 3 - Using the Control Program