[Zope] getting all form data (ZPublisher)

[O.l.i.v.e.r T.h.u.n.s]

Hi!

How could I get access to form data in a ZPublisher module (I don't use
zope, only ZopeHTTPServer and ZPublisher)?
I want to make a simple module which puts all the data submitted
through a form 
file.

Example:

http://127.0.0.1:9673/write?field1=heisst&field2=hier&field3=jemand&fiel
d4=duentsch

File output.txt:
field1	heisst
field2	hier
field3	jemand
field4	duentsch


The fields name should not be hardcoded in the module. I don't want:
def write(field1,field2,field3,field4):


Oliver