Function Keys; Attention - IBM 5280 Programmer's Manual

Function Keys
Attention
The Keyboard
This section explains the use of the following function keys, and their
interaction with the IBM 5280 system and your COBOL program:
Attention
Auto Dup/Skip
Auto Enter
Character Advance
Character Backspace
Character Delete
Character Insert
Cursor Left
Cursor Right
Duplicate
End-of-Job
Enter /Record Advance
Field Advance
Field Backspace
Field Exit
Field Exit Minus
Hexadecimal
Record Advance
Record Backspace
Res{(t
System Request
Two conditions are referred to frequently in the sections that follow: the
awaiting-field-exit condition and the awaiting-record-advance condition. The
following paragraphs explains what these terms mean.
In fields that require field exiting (for example, you have coded CHECK(FE)
in the related field description statement), an awaiting-field-exit condition
starts after the operator enters a character in the last position of the field.
This condition is indicated on the screen by the cursor blinking in the last line
of the field, and positions 15 and 16 of the Status Line contain 01.
An awaiting-record-advance condition exists after the operator enters a
character into the last position of a record when the automatic enter function
is disabled. The awaiting-record-advance condition is indicated on the screen
by the blinking cursor beneath the last position of the record. The status line
contains 00 in positions 15 and 16.
Pressing the Attention key permits the change of control between programs
operating in background and foreground partitions. For example, while
operating in the foreground, pressing the Attention key permits a program
operating in a background partition to attach to the keyboard/display if
operator action is required by that program. If action is required, the entire
display is replaced by that program.
After operator action, the original program resumes control if the background
program terminates. Otherwise, the operator can return control to the
foreground program by pressing the Attention key.
For more information, see the 5280 System Concepts manual under
"Partition Interface".
Chapter 1. Transaction I/O - Introduction 1- 7