>>>When running a report, I would like to figure out which record number the current page is in the underlying cursor, if that is possible.
>>>I have a reference to the Extension handler, and the previewform. During the preview, whichever page I have selected, the cursor is at the last record. Is there a reference somewhere where I can figure out which page relates to which record number? It's a report with header and details, so pagenumber is not recno() in that case.
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>>You could put a field with RECNO( "YourCursor" ) in the page footer. ISTR doing something like that a few times for report debugging purposes.
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>I would see the record number on the report, but is there a way I can refer to it in code during the preview? I have a method on the previewform that would display information about the current record corresponding to the current page.

Wild speculation - maybe the preview process re-opens your report cursor and uses that for previewing? (in the same way the SQL engine re-opens tables during SELECT etc.) However, even if that's the case I don't know how you would find or access that extra cursor instance, or if it even exists after the rendering of the currently selected page is complete.