#!/usr/local/bin/perl -w

use Tk;
use Win32::API;

Win32::API->Import('user32', 'GetAsyncKeyState', 'I', 'I');

my $main =  new Tk::MainWindow;
$main->geometry('1030x740');

my $vis = 1;

sub read_stuff
{
 &switch_vis if ((GetAsyncKeyState(0x04) & 1) == 1);
}
$handler = $main->repeat(50, \&read_stuff);


sub switch_vis
{
  if($vis == 0)
   {
    $vis = 1;
    $main->deiconify;
   }
  else
   {
    $vis = 0;
    $main->withdraw;
   }
}

MainLoop;