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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 "{No value for `esc'}^Hello world from window $WINDOW{No value for `esc'}\"
where ‘{No value for `esc'}’ is ASCII ESC and the ‘^’ that follows it is a literal caret or up-arrow.