Subcommand of [wm] to query or set the title of a toplevel window.
For editor-like apps, it is convenient to put the current file name into the title bar:
 wm title $w $filename
or, combined with the app name (Windows look & feel):
 wm title $w "$filename - $appname"
You can even retrieve the filename from there with [regexp], avoiding a [global] variable:
 regexp "(.+) - $appname" [wm title $w] -> filename ;# RS

Windows 2000 tolerates Unicodes (e.g. Chinese characters) in the title bar, but (at least at 8.3.4) [wm title] converts the title to system encoding, so everything exotic mostly ends up as question marks.
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