As AM posted, overrideredirect() is the method you want. However, when you do that, you may end up with no (easy) way to shutdown your GUI. So, before testing that method, I'd recommend you test something like this:

Button(-text => 'Exit', -command => sub { exit })
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However, when you do that, you may end up with no (easy) way to shutdown your GUI.

well, I imagine whatever your window manager shortcuts are still work, on onwin32 its Alt+F4 and it works to close the window

Hitting ctrl+c (if you used perl.exe) in the console also QUITS it :) Terminating on signal SIGINT(2)

But yeah, if you're going this route you should add a exit button, I prefer one that doesn't call exit :)

$mw->Button( qw/-text Exit -command / => [ $mw, q/destroy/ ] );
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I used the words may and easy in "... you may end up with no (easy) way ..." quite deliberately as I have no knowledge of what platform the OP is using. Regardless, we both seem to be in agreement that an "Exit" button is a good idea.

"I prefer one that doesn't call exit"

Why do you have that preference? Do you perhaps think that exit in a Tk callback refers to CORE::exit?

Take a look at this from Tk::exit:

"If calling exit from code invoked via a Tk callback then this Tk version of exit cleans up more reliably than using the perl exit."

and a little further down

"... Tk::exit is imported by default ..."

or simply look in your copy of Tk.pm:

...
@EXPORT    = qw(Exists Ev exit MainLoop DoOneEvent tkinit);
...
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As for destroy() (documented in Tk::Widget), you'd only need to use that (on your MainWindow object) if you had code after MainLoop which you needed to execute. Here's an example of the difference:

#!/usr/bin/env perl

use strict;
use warnings;

use Tk;

my $mw = MainWindow->new;

$mw->Button(-text => 'Exit', -command => sub { exit })->pack;
$mw->Button(-text => 'Destroy', -command => sub { $mw->destroy })->pac
+k;

MainLoop;

print "After MainLoop\n";
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Sample runs:

$ pm_tk_exit_vs_destroy.pl  # Using 'Exit' button
$ pm_tk_exit_vs_destroy.pl  # Using 'Destroy' button
After MainLoop
$
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-- Ken

I'd love to help, but what exactly are you trying to do? I.e., what module are you using to create the window? Tk, for example? What have you tried so far (posting a short example that illustrates the problem would help).

Perl Tk :). I don't have much to share since I don't know how it can be done. I'm looking for an attribute that when it will be passed to a TopLevel or MainWindow it would change its appearnce to be borderless and without leaving a trace at the taskbar. Thanks

Remove all decorations (ie, title-bar and WM buttons) from a Tk window, Make decoration-less windows in TK, and not lose functionality.

use Tk;
my $mw = tkinit();
$mw->overrideredirect(1);
MainLoop;
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