FS/2 uses six internal windows to display a list of
available drives
on a system, directories of
a
single drive (or multiple drives) and files
in two directories. These windows are contained within the FS/2
frame
window, and hence are referred to as internal windows. The four list
windows are located
adjacent
to each other in the center of the FS/2
window. A Toolbar window is
normally
located just above these windows (it may be hidden if desired) and is
used
to initiate various operations and commands. A Data
Panel window is located at the bottom of the display and provides
various
data windows and a message window. If desired, it may also be hidden by
using the F9 toggle key.

These six internal windows are the main focus of the FS/2 display. However, FS/2 uses many other dialog windows (generally referred to herein as simply a "dialog") to present information and obtain input.
See the following related subjects:
The Active Window
Internal Window Sizing
Expanding and Restoring
Internal
Windows
Resetting Internal Windows
Swap window
Message window