Command: ctty
  CTTY changes the terminal device used to control your system.
Syntax:
  CTTY device
  CTTY [/?]
Options:
  device  The terminal device you want to use.
          Valid devices are prn, lpt1, lpt2, lpt3, con,
          aux, com1, com2, com3, com4, NUL.
  /?      Shows the help.
Comments:
  CTTY is a command internal to command.com and needs no other file
  in order to work.
Examples:
  CTTY lpt1
  CTTY /?
See also:
  - nowhere -
File:
  Please read this command's lsm file also.
  You will find the updated version (internet) here and
  the version described in this manual page here.
  The lsm file contains information about the name of the programmer,
  the download site, and some other command related information.
  Copyright © 1998 Jim Hall, updated 2007 by W. Spiegl.
  This file is derived from the FreeDOS Spec Command HOWTO.
  See the file H2Cpying for copying conditions.