INT 33 - MS MOUSE - RETURN BUTTON RELEASE DATA
        AX = 0006h
        BX = button
            0000h left
            0001h right
            0002h middle (Mouse Systems/Logitech mouse)
Return: AX = button states
            bit 0 left button pressed if 1
            bit 1 right button pressed if 1
            bit 2 middle button pressed if 1 (Mouse Systems/Logitech mouse)
        BX = number of times specified button has been released since last call
        CX = column at time specified button was last released
        DX = row at time specified button was last released
SeeAlso: INT 62/AX=007Ch