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(screen.info)Privacy Message

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Using the message line from your program
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   The message line facility can be used by an application running in
the current window by means of the ANSI "Privacy message" control
sequence.  For instance, from within the shell, try something like:

     echo "^Hello world from window $WINDOW\"

   where `' is ASCII ESC and `^' is a literal caret or up-arrow.