Here is a nice tk popup that might fit the situation.

#!/usr/bin/perl
# test prg for notifiction window 
use Tk;
use strict;

my $mw_bdw = 2;  #mainwindow border width 
### Create a Mainwindow ### 
my $main = new MainWindow(-borderwidth=>$mw_bdw,
                          -relief=>'ridge',
                          -bg => "#0000FF");

$main->geometry("150x100+0+0"); # displaying at top left on any resolu
+tion 
$main->overrideredirect(1); # Remove window decorations 
### create a text widget ### 
my $imstr = "THIS IS A TEST NOTIFICTION LONG ENOUGH TO WRAP";
my $TEXT = $main->Text(
                       -foreground=> 'white',
                       -background=> '#0000FF',
                       -wrap => 'word',
                       -height => 7,
                       -width => 50)->pack;

$TEXT->insert('end', "$imstr", );

$main-> after(5000, \&exitprg); # autoclose in 5000 milisecs 
MainLoop; # for continuos display of window 

#### FUNCTIONS #### 
sub exitprg {
print STDERR "CALLED EXIT\n";
$main-> destroy; # to kill the window and exit from prog 
}
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