http://purl.org/tcl/home/man/tcl8.4/TkCmd/message.htm
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Roughly spoken, a multi-line label which can reformat itself to shrink-wrap the contained text. See [a little fortune teller] for a usage example.
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[Category Widget] - [Category Command] - [Tk syntax help] - [Arts and Crafts of Tcl-Tk Programming]