How do I call an SSRS Report from a stored procedure, and pass parameters?

Hi all,

I have a Report, that I want to run ad-hoc from a Stored Procedure. 

I want to render this report to PDF format, and save it to a drive.

The difference between this post and most threads I've seen is I don't want to run a stored proc within the report and send parameters to the stored proc.

I DO want to call a report FROM the stored proc, and send parameters TO the report.

How can I do this?

Many thanks,

Jason