>My interest appears to be somewhat different than others ... I have a row in my grid already that has "totals", although they're not always simply computable totals. Furthermore, my grid is readonly, so I don't have to worry about recomputation.
>

You can Select the row with total in one cursor and build a grid with the cursor as recordsource. That grid has headers and is on top of the data grid, with HeaderHeight=0. You need a filter, to avoid the total row to be displayed in data grid

>So, what I'll be looking for (when I get to it in a few days or so) will be the alignment of the secondary grid, horizontal scrolling, and handling of events.

This was the most difficult part :). Particularly when grid have locked columns at left.