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 Documented in Volume 1 of the UNIX Programmers Manual.

 % mesg
  lists the current state of your terminal for 'write' access by other
  users.  If write access is allowed, then messages can be transmitted to
  your terminal via commands such as 'talk' or 'tell'. If write access is
  not allowed, then no messages can be sent to your terminal.

 % mesg n
  disallows 'write' access to your terminal by other users.

 % mesg y
  allows 'write' access to your terminal by other users.

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