for clarification, the digitizer is the tech in the screen and the
stylus is what you use to poke the screen ;-)

Generic styli such as those used for pocketpc's and most of the small
umpc's _do not_ work with the digitizer screens.

You will need to obtain the stylus for your computer from the oem or
store that stocks those styli.

I would _assume_ that any stylus used for any waacom screen would work
on any other, but have not tested this.

There are some "custom" waacom styli available... google time.

>> to always hold the pen the same way <<

yes and no... it's optical.

Our eyes are far more accurate than we imagine. On a tablet, you are
not writing on the actual surface, but, rather, on the clear cover a
couple of mm above that surface.

Your expectation is that the script will appear where the centerline of
the stylus intersects with the surface where the writing will appear.

When you "calibrate" you essentially define the difference between where
your stylus touches the clear cover and where the writing will appear on
the lcd surface... since the stylus is normally held at an angle, hold
it at a different angle such as in the other hand, and the script will
appear in an unexpected location... and, points and clicks will miss
your intended target.

To see this, open a new journal document, get a magnifying glass and
take a close look at where things appear when the stylus is held in each
hand.

Hope this is of value,
Beverly Howard [Microsoft MVP-Mobile Devices]