IBM 3270 Manual page 267

INDWS
INDWS027 All other windows are hidden:
Next window is now visible
Explanation: When you performed a Hide, all
other windows for that screen profile were
already hidden, forcing the previously active
window to become visible. At least one window
will always be visible on a defined screen profile.
User Response: Make sure at least one window
is visible that you do not need hidden before
hiding another.
INDWS029 Color setting override: Changes
may not show
Explanation: Although your changes were
made, the selected window is currently receiving
instructions to ignore the selected settings. The
colors appear after the window stops receiving
instructions to ignore them.
User Response: Your color changes have taken
effect. Go to your next operation. For more
information on color, see Chapter 9.
INDWS030 Foreground and background
colors are the same
Explanation: The foreground and background
colors of the selected windows are identical.
This causes your typed characters to be invisible.
User Response: This is a warning message. If
you want to be able to see the characters in this
window, change either the foreground or the
background to a different color.
A-82 Book 3 - Using the Control Program