external.zOrder - write only, long integer. Assignment changes the
            window Z-order position. Example:
            external.zOrder = 1;
            Moves the window to the to the foreground,
            Meaning of the assigned values:
            -1 - Moves the ALPFrame window to the bottom/back of all the
            windows.
            0 - Makes the window normal. Removes "top most"
            flag if it was previously set
            1 - Moves the window to the top of all the windows on the
            screen except the "top most" windows
            2 - Makes the window "top most" and moves it to the
            foreground (see also WS_EX_TOPMOST
            flag).