OVER

Syntax: OVER [#channel,] switch
Location: QL ROM

This command allows you to set the way in which anything is written to a specified window (default #1), whether by PRINT, LINE, BLOCK, or any other command which prints something on a window.

When the QL is first initiated (or following a MODE command), OVER is set to 0 (see below). This can be altered by giving a different value for switch which will have the following effect:       

switch effect 
-1     Everything is PRINTed on a transparent strip.
       However, each pixel which is drawn on that
       window in the current INK (or with BLOCK) is
       xored with the colour of the existing
       background.

0      Characters are PRINTed in the current INK
       and STRIP and any pixels plotted on screen
       are also in the current INK.

1      This PRINTs characters on a transparent
       STRIP but pixels are drawn in the current
       INK colour. BLOCK is unaffected.

NOTE:
OVER 0 is set after a MODE command.

CROSS-REFERENCE:
Please look at INK and PRINT.
