{Window.PAS}
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  {Sample code for the Window procedure.}

  uses Crt;

  var
    X, Y: Byte;
  begin
    TextBackground(Black);   { Clear screen }
    ClrScr;
    repeat
      X := Succ(Random(80));   { Draw random windows }
      Y := Succ(Random(25));
      Window(X, Y, X + Random(10), Y + Random(8));
      TextBackground(Random(16));   { In random colors }
      ClrScr;
    until KeyPressed;
  end.