printf in debug.ini file for debug windows with fonction editor

kill button*
kill func*

signal void affichage (void) {
  while (1) {
       printf ("%u %u %u %u %u %u %u  \n",
        display_J1,display_J2,display_J3,display_J4,display_J5, display_J6, display_J7);
       twatch (500);
  }
}

define button "start simulation", "affichage ()"
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the probleme is that my printf fonction return alltime to a nieuw line.
My question:
Is it possible to clear the screen before to do the printf?

in the same time is it possible to export some variable in debug seesion for using it with a other vb program for design simulation?

tanks for your answer.