Nondisplay Fields
This feature
of
the 3278 allows the program to cause the information in a field
to
be nondisplayable. An example
of
the
use
of
a nondisplay field
is
using such
a field for entry
of
your operator identification when you log
on
your display
station.
When
you enter
your
operator identification into the nondisplay field,
your
operator identification remains secret, because it
is
not
displayed on the
screen.
The user's program guide for the program that you are working with should
designate which fields on the screen
are
nondisplay fields.
Cursor
The cursor operation
is
an important operation for you
to
understand when you
are working with the display image. You will find
that
the flexibility
of
the
cursor makes operating a 3278 easier and more enjoyable than operating a
type-
writer or a keypunch. For example, moving the cursor
is
easier and faster than
repositioning the carriage
of
a typewriter or transporting the card in a keypunch.
Two types
of
cursors can be displayed on the screen
of
a 3278: the normal
cursor and the alternate cursor. The normal cursor appears on the screen
as
an
underline to the character position in which it
is
located (Figure 2-5).
Figure
2-5.
The nonnal cursor looks like
an
underscore.
The alternate cursor
is
a reverse image
of
the character
that
is
located in the
same character position
as
the cursor (Figure 2-6).
By
using the ALT CURSR
and CURSR BLINK keys (described in the keyboard sections), you can select
either type
of
cursor and
you
can also make the cursor blink on and
off
continuously.
Chapter 2 Controls and Indicators 2-15
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