cancelling a report run from web form

Dear All,

Can anyone inform me of a way to cancel a report once it has been started, when run from a web form?
Similarly, if there is an error in the report then an error message pops up for every record the report returns, and I can find no way of cancelling this.

Thanks,

        Simon.

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Simon Hoadley					Simon.Hoadley_at_aber.ac.uk