I'm trying to use the object model of Sharepoint 2007 to make some changes over a list and read users and groups web settings...
For that I developed a Web Service (WCF) that is stored in the same web application as the sharepoint site in IIS.
I call inside the Web service
and thats user is not me, is "Sharepoint\System"
Other thing is that web I try to get all users using
that only contain "Sharepoint\System", not the others.
I give the full trust in the web.config and use the Ntlm authentication method.