Command: beep
  BEEP makes a beeping sound (usually by system loudspeaker).
  BEEP is a BATCH-FILE / AUTOEXEC.BAT command.
  It can also be used in command line.
Syntax:
 beep [options]
Options:
  /?  Shows the help.
Comments:
  BEEP can also be used outside a batch file.
  BEEP is a command internal to command.com and needs no other file
  in order to work.
Examples:
  IN A .BAT FILE / AUTOEXEC.BAT:
    beep
See also:
  autoexec.bat
  batch files
  Copyright © 2003 Robert Platt, updated 2007 by W. Spiegl.
  This file is derived from the FreeDOS Spec Command HOWTO.
  See the file H2Cpying for copying conditions.