Impersonation again

I had an earlier post with complicated steps, so I've stepped back to
something more simple.
VS2003, Win2003 server, XP clients
I create a web share on the server and give it all permissions. I enter this
string in the run box off the start menu and, Win 2003 server prompts me to
logon, and I enter username and password of an account on the standalaone
server and I get a file listing.
....http://www.myserver.com/dummy
How can I do this through vb.net without using a sendkey scenario? I've
tried WNetAddConnection2 but that does not appear to work with a web
address, (or I don't know how to get it to). I've tried many diff. params
with the NETRESOURCE struct to no avail, even used IP address instead of
URL. Any other way to do this?
Thanks,
BUC