Prima is marvellous ! I don't understand in this short program, why the function "system()" don't execute its return on my computer "Windows XP", although on my computer "Linux Redhat" the message "Fin de la commande dir !" is given. This message isn't printed with XP. Could you explain me ? why i have this behaviour. Thanks a lot, --alain use Prima; use Prima::Application; use Prima::MsgBox; CORE::system("dir"); Prima::MsgBox::message_box("Info","Fin de la commande dir !");