While you are using DOS or running another program, there are various keys
that are interpreted by DOS as having special meanings.  In the descriptions
below the notation "Ctrl-key" means that you press both the Ctrl key at the
left side of the keyboard and the key name following the hyphen "-" at the
same time.  Press the keys discussed sharply, that is don't press the key and
leave your finger on it.  Most keys have an "auto-repeat" feature that
repeatedly sends the key code to the computer after the key has been pressed
for about 1 second.  If some of these keys are received that fast by programs
the software locks up (crashes) and you will have to restart the computer.

Ctrl-Break  - Stop program execution.  This has no effect at the DOS command
              level, but will stop a program such as the DIR command and will
              return you to the DOS prompt.  If the program you wish to stop
              does not output to the screen often, the program may not stop.
              This can be changed using the BREAK command (see the help file
              BREAK for details).  The Ctrl-C key has the same effect as the
              Ctrl-Break key and may be pressed using one hand.

Ctrl-NumLock - Stop the screen display output until any other key is pressed.
               This keeps useful information from scrolling off the top of the
               screen before you've had a chance to read it.  Pressing any
               other key resumes the display output.  The Ctrl-S key has the
               same effect, and may be pressed using only one hand.
PrtSc  - Print the information currently on the screen on the printer.  This
         command is discussed in detail in the help file GRAPHICS.

Ctrl-PrtSc - Echo all information displayed on the screen on the printer.  The
             first time the key is pressed the printer output is started, the
             next time the key is pressed, output stops (the key acts as a
             on/off toggle).  This can be really handy for getting directory
             listings of diskettes.  Make sure your printer is turned on and
             on-line before issuing this command.

Crtl-Alt-Del - Pressing all three keys at once will reset the system.  A
               beep should acknowledge the reception of the command and after
               a few seconds the system should restart.  If nothing happens,
               it indicates the computer is not listening to the keyboard and
               the only way to get its attention is to turn the power off,
               wait five or ten seconds, then turn the power back on.

F6  - DOS normally interprets this key as an "end-of-file" (EOF) indication.
      This can be useful when you are using the keyboard for input in a
      situation where a file is normally used (see the help files REDIRECT and
      COPY for details).  If the function key has been redefined by some
      software package, the key will no longer be interpreted as EOF.  The
      Ctrl-Z key is always interpreted as EOF so if in doubt, use it instead.
Various keys are available to "edit" the command line you are specifying for
the next DOS command.  The function keys may not have the same meaning if your
function keys have been redefined by some software package.  The editing
features can be really helpful if you are entering many commands that are
almost the same.  The last command entered is retained and may edited using the
commands shown below:

F1  or  the Cursor Right key  - Display the next character from the last
                                command line.
F3  - Display all remaining characters from the last command line.
F2  - Display all characters up to the specified character from the last
      command line.
F4  - Skip all characters up to the specified character from the last command.
Del - Skip one character in the last command line.
Ins - Insert the following characters until the "Ins" key is pressed again.
F5  - Save this line in place of the last command line and allow more editing.
Ctrl-Enter  - Continue command entry on the next line of the display.
Esc - Cancel the current command line and start all over again.
  - Give MYFILE a new time and date (commas indicate the end of
      the source file names).  Global file