I think users shouldn't have to do the stuff described below. I hope I
can find the time to make the calibration program a little bit more
intelligent so it can make all modifications on XF86Config itself.

BEFORE you begin with the calibration procedure your touchscreen
should be configured as described on the web page
http://www.conan.de/lifebook/lifebook.html. 

Before you can calibrate the touchscreen you have to tell the
touchscreen driver to send the raw coordinates to the calibration
program. You can do this by inserting the line "Option "Calibrate"
"1"" into the  "InputDevice"-section of the the touchscreen in the
file "XF86Config-4".

This configuration file is usually located in the directory
"/etc/X11". 

The "InputDevice"-section of the touchscreen can be easily located by 
searching for the line "Driver "evtouch"". Within this section insert 
the line described above ("Option "Calibrate" "1""). 

Remember this line since you have to delete it again after successful 
calibration of your touchscreen.

As next step it is necessary to stop the XWindow system. If in your
case X is alway running you have to stop it. (e.g. With SuSE run Yast2
to stop X: Yast2, System, Runlevel Editor, Runlevel-Eigenschaften, scroll to
xdm and delete the tic under Runlevel 5. That means that XDM is no
longer started during startup of the system and you can normally
log in via ASCII login.)

Now you can start the calibration program "calibrate.sh" from a text
console. X MUST not run during this step.

If you start "calibrate.sh" a white screen with 9 black crosses should
appear. 

The first calibration step consists of finding the maximum and minimum 
coordinates. To do this just touch the screen with the pen along all
edges and corners. DO NOT KLICK -- Just move the pen accross the
screen. After your first touch of the screen two text lines should
appear somewhere in the upper left area of the screen. For you only
the first line is interesting. This line shows the currently found
minimum and maximum values of the X- and Y-coordinates.

It is always safe to run calibration.sh with root permissions. If
something does not work all right with the calibration (e.g. The
numbers on the screen do not move) try running calibration.sh as
root. 

Keep moving the stick along the edges of your screen until you think  
you have found the maximum and the minimum coordinates. Now press
return to go on to the next step of the calibration.

Now you can do the fine-tuning of the touchscreen. After you have
pressed return the upper left cross should turn red. Begin touching
the red cross on the screen. If the pen is EXACTLY over the red cross
press the left mouse button. Now the next cross should turn
red. Repeat this process with all crosses on the screen. If you
accidently click twice you can go one step back by pressing the right
mouse button. 

After you have clicked on the last red cross the calibration program
writes the file "out.txt" to disk. This file contains the calibration
parameters which have to be merged into "XF86Config-4". Open both
files (out.txt and XF86Config-4) in your favourite editor and merge
the lines in "out.txt" into the "InputDevice"-section of your
touchscreen.

The x- and y-values in out.txt should be reasonable low numbers
(something between -20 to 20 maybe even lower). These values are the
amount of pixels the cursor has to be corrected on a certain
position. So it makes no sense to merge out.txt to your XF86Config-4
if there are completely insane numbers in out.txt. 

Erase the line "Option "Calibrate" "1"" or disable it with a "#"-sign
in front of it.

That's it.

You have (hopefully) sucessfully calibrated your touchscreen.