Sweet. How coincidental - I was pondering exactly this the other day. I've been rewritting the old windows video-game Gazillionaire (http://www.lavamind.com/gaz.html) in Perl/Tk for my own amusement recently and I was thinking about how to do a fullscreen mode using just Tk. Between this and your other node on removing decorations, this is perfect! 
$w->{main}->overrideredirect(1);
$w->{main}->geometry($w->{main}->screenwidth."x".$w->{main}->screenwid
+th."+0+0");

[download]
{NULE}
--
http://www.nule.org

In reply to Re: Center a Tk window on the screen by {NULE}
in thread Center a Tk window on the screen by bbfu

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