Lennart Augustsson writes:
> > The core protocol has no support for more than two axes in the pointing
> > device; it's full of structures with two fields for coordinates.  Look
> > at almost any pointer event, for example, or the QueryPointer reply.
> The mouse protocol decoder can map the Z axis to either the X axis, 
> the Y axis, or button4/button5 events.  The latter can be put to good
> use for scrolling up and down when the mouse wheel is turned.

Its a shame that we can't have a true Z axis, since then we could get
much more fine grained scrolling.

Perry