AT&T Unix Owner's Manual page 114

Working with Windows
Any other open windows are available for use, but they
are suspended. The other open windows wait for you to
make them active.
The commands you give affect the active window. Before
giving a command, you must resume the window that you
want the command to affect.
Suspending and Resuming Windows
When you suspend a window, you are setting it aside for
the time being. It is still on the screen and
available for use. Suspending a window, unlike closing
a window, does not remove the window from the screen.
Any task or program running in a suspended window
continues to run. For example, you can start printing
a file in one window, suspend the window, and work on a
different file in another window. The printing
continues without interfering with your other
activities. You don't have to wait for the processing
in the suspended window to finish.
When you come back to a suspended window, you are
resuming it. When you resume a window, the previously
active window is suspended, and the resumed window
becomes the active window. The resumed window is made
the top window, and its border becomes highlighted.
You can suspend and resume windows in three ways. You
can point to a suspended window with the mouse, you can
use the NEXT WINDOW and PREY WINDOW keys to make
windows active in succession, or you can use the Window
Manager menu to select the window you want.
Suspending and Resuming Windows with the Mouse
To suspend the active window and resume a different
window:
1 Point to any exposed portion of the suspended
window.
2 Press <BI>.
The suspended window is resumed.
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