13.3. Widget's ID
$id = $widget->id; print "$id\n"; # Prints 0x9c944c
This returns a hex value. A common use for this method is to embed a Tk window in another application. The PerlPlus Netscape plug-in does just this. It is described in Chapter 22, "Perl/Tk and the Web".
13.3.1. Widget's PathName From Its X11 ID
$path = $widget->pathname($id);
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