IBM 3270 Manual page 119

3. Press the Foreground key (PF23).
This line at the bottom of your screen
changes to:
Select the color setting
de~ired
by using the color coded keys.
WSCTRL SETUP COLOR FRGND
4. Press the Alt key and one of the Color keys
(PF13 through PF20) to choose the color you
want.
5. If you don't like the color you chose, press
the Alt key and a different PF key.
6. When you have the color you want, press the
Finish key.
You can now choose to color other windows
or the screen. Press the PF key for what you
want to change.
7. If you are finished changing colors, press the
WSCtrl key to go back to using your
windows.
You are done.
9-22 Book 3 - Using the Control Program