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

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



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