IBM 3270 Operator's Manual page 58

DUPKey
Pressing the DUP key displays an overscored asterisk (
* )
when the A,aIA
switch is set to
A,a~
when the A,aIA switch is set to A, only the asterisk is dis-
played. Also, as a result, the cursor advances to the first character location of
the next input field.
The DUP operation is intended to provide you with a fast method of filling in
the information that is the same for every document (such as the date). The
DUP key causes a special code to be sent to the host system which tells the
program that a duplication operation is needed. The program you are working
with, however, determines the use of the DUP key. To verify its use, ask the
appropriate person in your organization about its use or refer to the appropriate
user's program guide.
FIELD MARK Key
Pressing the FIELD MARK key displays an overscored semicolon ( -;) when
the A,aIA switch is set to
A,a~
when the A,aIA switch is set to A, only the
semicolon is displayed. The FIELD MARK key is used when operating with
an unformatted display to indicate the end of a field to the program.
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Chapter 3. Keyboards 3-13