Accessing GPIO input

I'm not shure, if this is the right group for posting this question,
but maybe there is someone who can help me.

I'm progamming on Windows Ce with the compact framework on the
"Wafer-LX-800"-Board (have a look at www.ieiworld.com; it has an
"x86"-processor) and I need to read the GPI0 ( its Pin7 at the GPIO
connector and it should be defined as input). But how can a do this by
using C#

I've already searched the web. The most promising idea was the use of
the class "PysicalAddressPointer" of the OpenNetCf-Library
(www.opennetcf.org). But I failed in finding out which adress to use
and how to "read" the nececarry pin.

I would appreciate any help!

Sabine