Why would you configure a second Server Intelligence Agent (SIA) on the same host?

You want to grant a group of users the right to create, save, modify, and refresh Web Intelligence documents.
You assign View on Demand access to the universes.
For which additional object types must you set permissions?
Note: There are 3 correct answers to this question.

User A designs a document and exports it to a public folder on the business intelligence platform. User B moves the document to a different folder. User C schedules the document. User D opens the latest instance of the document.
At this point, who is the owner of the instance?

Which actions does the Server Intelligence Agent (SIA) perform during start-up?
Note: There are 2 correct answers to this question.

User1 scheduled, ran, and viewed the first page of an instance of a Crystal report. User2 can view the first page of the report as well. However, when User2 tries to view the second page of the report, an error message is displayed.
Which server could be the cause?