Hi Harry,OK, let's do this instead. When MOUSE = ON is not set, you can temporarily force the two values of the WHEELMOD directive (default is "1,2") to switch by holding the left or right mouse button while using the mouse wheel. With this, you can scroll horizontally using the mouse wheel even if your mouse does not have the horizontal mouse wheel. Please try the latest build of vDos-lfn for this new feature.Wengier