Hi Jim,
>
>On the assumption that even Rushmore does NOT provide data from indexes to the program, why would Rushmore's bitmap be of any use when reading records contiguously?

Scenario 1: No records to read at all<g>. Cdx disk IO saved.
Scenario 2: Seek-Scan is used only to speed up, walking in a different order is only a by-product, walking sequence "really" is of no consequence. Scan in the seek-scan scenario has to read the cdx "before" each dbf-record pointer movement. If scanning via Rushmore's bitmap, the dbf-records are accessed via the bitmap and the cdx overhead is saved.

regards

thomas