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perl-tk 1:800.025-2
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#!/usr/local/bin/perl -w 

use Tk;
use IO::File;
$ENV{'PERL5LIB'} = join(($^O eq 'MSWin32') ? ';' : ':',@INC); 

if (@ARGV)
 {
  open(STDOUT,">&STDERR");    
  my $id = shift;
  print "$id\n";
  my $mw = MainWindow->new('-use' => oct($id));
  print "id = $id, use=",$mw->cget('-use')," mw id=",$mw->id,"\n";
  $mw->Label(-text => "This is process $$ using $id")->pack;
  $mw->Button(-text => 'Quit', -command => [destroy => $mw])->pack;
  
  MainLoop;
 }
else
 {
  my $mw = MainWindow->new;               
  my $f  = $mw->Frame(-borderwidth => 6, -relief => 'sunken', -container => 1)->pack;
  my $id = $f->id; 
  $mw->Label(-text => "This is process $$ providing $id")->pack;
  $mw->Button(-text => 'Quit', -command => [destroy => $mw])->pack;
  my $fh = IO::File->new("$^X $0 $id|");
  MainLoop;
  $fh->close;
 }