tk/wm title

(tk/wm 'title #<widget> ?string?)
If string is specified, then it will be passed to the window manager for use as the title for #<widget> (the window manager should display this string in #<widget>'s title bar). In this case the command returns an empty string. If string isn't specified then the command returns the current title for the #<widget>. The title for a #<widget> defaults to its name.

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