Does report support this parameters: ...&rs:Format=HTML4.0&rc:Parameters=false&Chain

hi,
I am working on some report page which will be access via URL.
And I found some old reports URL look like this:
....&rs:Format=HTML4.0&rc:Parameters=false&UserID:isNull=True....

What does the UserID:IsNull=True means? Is this right format for SSRS2005?

Thanks

The UserID:IsNull=True notation is special syntax that allows you to pass null values as report parameters. In this case, you're passing null to the UserID parameter. For more info, see Books Online here:

http://msdn2.microsoft.com/en-us/library/ms155391.aspx

Here's all the info about URL access with Reporting Services:

http://msdn2.microsoft.com/en-us/library/ms153586(en-us,SQL.90).aspx

Best,
Chris