I don't remember where I found this snippet but here goes: 

$mw->geometry($mw->screenwidth . "x" . $mw->screenheight . "+0+0");

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Originally posted as a Categorized Answer.

In reply to Re: How can i maximize a Tk application on win32 ? by Mr. Muskrat
in thread How can i maximize a Tk application on win32 ? by Vennis

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