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The Tk extension is a Graphical User Interface widget toolkit implemented by John Ousterhout for the Tcl scripting language.

Since its release, it has been used in other languages, such as Perl, Python, and Ruby; and ported to run on most flavors of Linux, Apple Macintosh, Unix, and Windows.

TK is also an abbreviation used in journalism to indicate "to come" or forthcoming.

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