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>>>I don't think there is a way to absolutely be sure, even going through the Win API. The report could spool to the printer and Windows would think it printed.
>>
>>There are ways to do this, but it involves spooler interaction through the API, and it gets complex when networked printers are involved. Bela Bodecs produced an FLL that changed the name of print jobs, so he obviously accessed the spooler interface, as File#9319, and he provided source, so this might be a good place to start...
>
>Seems to me that you still can't guarantee that it will always work. The printer will have to provide that information back to the OS. I know, for example, that our HP 4 will hold several pages in memory, but the OS thinks that print job is complete, when in fact it isn't.

Yep, our 5si's definitely report early completion, but request a resent if they run out of paper or jam.