Dan,
Can you elaborate when you say, "Though in FusionPro VDP 10, you can write back to an ExternalDataFileEx object if it's in a flat-file (tab- or comma-delimited) format." Do you have a sample template that does this? Or, what would a rule look like if I added it to the FrodoTravel example in the FusionPro tutorial folder, say (even though the outcome is obvious with the Frodo template) I want to capture the sheets used in the job using a rule, return FormatNumber("000000",((FusionPro.Composition.pageNumberInJob/2)))?