>Holy cow - there's a lot of information there, but, it doesn't say anything about a COM+ package which will solve the problem fairly simply...

We used the information and ended up using the RevertToSelf and LogonUser function to access the network drives. I guess I never tried the COM+ stuff. I wonder if that would have work for what we wanted. We wanted to use "NT Challenge/Response Authentication" so we could get the userid of the person hitting our webservice but then get access to the network drives, which NT Challenge/Response will NOT give you access to. So we save the userid in our COM objects init then RevertToSelf then we used LogonUser function with a user that only had access to the one part of the network we needed access to. I didn't think COM+ would give us the userid of the person hitting our webservice, would it???