Report Builder - parameters

Is there a way to pass a parameter to the report builder?

We are not using impersonation to call the report builder so we don't know who the actual user is. We want to be able to pass the UserID to the report builder so we know who the actual user is supposed to be.

Thanks.

Sorry, currently the only parameters that can be passed to Report Builder are a server path, startup model, startup perspective or startup report.