+Values known for all pages:
+
+* page (the current page)
+* destpage (the destination page)
+* basename (the base name of the page)
+* recno (N if the page is the Nth page in the report)
+
+### Prev_Page And Next_Page
+
+The "prev_page" and "next_page" variables will give the value of the
+previous page in the matching pages, or the next page in the matching pages.
+This is mainly useful for a "here_only" report.