Crystal reports and web services

I have reports fromm an older version of software that I'm trying to incorporate into a new version using web services written in vb.net. I'm calling a crystal report viewer from a parent form. The crystal report viewer utilizes web services to run a particular query to populate the report. However, there are a few things that I have questions about:

There is still an internal query in the report but I'm using the setdatasource method and reportsource property to fill the report with the dataset pulled in by the web service. Some of these reports take 5 to 10 minutes to run. Is the internal query being overidden? Is the method of using a web service and a crystal reports viewer in a vb app (not a web app) bogging this process down? Also, there is an interim screen that pops up after the web service has been run that asks for parameter values for the report's inner query. How can I set this value to "All" programmitically?

Thanks for any help.