Reporting Services

Is there a way to connect to a specific report using URL access? I have tried passing my username and password via the prefixes dsu and dsp, but continue to get the pop up security window. While I understand I don't want to pass my username and password via URL, unless it is somehow encrypted, there must be a way to accomplish this. Of course this may not work with discountasp, but I am trying to find out how any others are utilizing Reporting Services.

I also noted that I cannot create a linked report.

Any assistance would be greatly appreciated.

Thanks.
Marc