I suppose i made a mistake for not giving more details about what i wanted to do; sorry for that. What i wanted to know is which perl modules for graphical user interface are the best ones (or the most easy to use).
I think, you have convinced me, with the Gtk2 :) ...

I want my app (i should say part of my app) to get an Ip address using dhcp (worse case, this process takes about a minute). For mataining the user informed, i wanted to show a progress bar for avoiding the user desperation.

 ...
 $w = CreateWindow(...);    # full screen window
 DrawBackgroundPicture($w,'file.jpg');
 $p = CreateProgressBar($w, \&timer);
 RenderAndPrint("Waiting for a new Ip address", 'verdana'); 
 $p -> Start();
 $_ = `dhclient -e eth0 2>&1`;
 ($ip) = /bound to (\d+\.\d+\.\d+\.\d+)/;
 $p -> Stop ();
 unless ( $? ) {
     NextScreen(...); #we must introduce manual config  
 } else {
     MsgBox("Configured correctly ...");
 }
 NextScreen(...); #Next Task ...
 ...
[download]

I will re-read your code, and put my hands-on the Gtk2 stuff. Thanks a lot.

turo