Thank you for your reply. I have read something about this caspol, but up to now I just could not figure out, how to handle it. To me it seems very very complicated. And beside of that, as far as I understood, it doesn't really exactly the same as the Config.Wizard, it seems to create some code group, but I only want to change the existing security setting. Or am I all wrong? Well, anyway, I don't know how to enter in this caspol from within my app-code. Microsoft help only confuses me.