SW_MAXIMIZE = 3
      SYS "ShowWindow", @hwnd%, SW_MAXIMIZE
      VDU 26

      W% = @vdu%!208 * 2
      H% = @vdu%!212 / 2

      COLOUR 1,9
      COLOUR 2,10
      COLOUR 3,12
      COLOUR 4,13
      COLOUR 5,14
      COLOUR 6,11
      COLOUR 7,15

      Y% = H%*4
      FOR P% = 1 TO 4
        Y% -= H%
        FOR X% = 0 TO W% STEP 4*P%
          C% = (C% + 1) MOD 8
          GCOL C%
          RECTANGLE FILL X%, Y%, 2*P%, H%
        NEXT
      NEXT P%