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Using Light Pen Emulation
Selection Fields
Attention Fields
A selector light pen is a light-sensitive pen that can detect the light emitted from
characters displayed on certain 3270 displays. With the pen, you can select from a
list or table of displayed items and can then cause those selections to be passed to
the application program. The 3708 allows you to emulate this light pen function
using the Cursor Select function. This is done by positioning the cursor (using
normal cursor movement functions) in the field that you wish to select and then
entering the Cursor Select key sequence. Depending on the way that the host
program has defined the field, you can obtain different results.
A selection field is identified by a question mark (?) in the first position of a field.
To select the field, position the cursor anywhere in the field and press the Cursor
Select key sequence. The question mark (?) is changed to a greater than (> ) symbol.
To reverse your selection, press the Cursor Select key sequence again. The greater
than (> ) symbol is replaced by a question mark
(?).
An attention field is identified by either a space, null, or ampersand
(&)
in the first
position of the field. Place the cursor anywhere in the field that you wish to
attention, then press the Cursor Select key sequence. When you press the Cursor
Select key sequence (when the cursor is in an attention field), information about all
fields that you have either selected with Cursor Select or modified with normal
keyboard input is transmitted to the host program.
Chapter 2. Operating in Full-Screen Mode
2-19
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