I would really like to know where you found this out, and if there is more detailed information like this at that source...

It seems very difficult to ontain detailed technical information about the inner workings of VFP.

>Mike,
>
>This is the best, most concise explanation I have ever heard on this topic.
>
>Way to go...
>
>
>>I'm not sure how much the technology has changed and how much I remember correctly :), but basically Fox has 64K chunks of memory for creating bitmaps of records that match a given optimizable condition. The bitmap stores a 0 or 1 for each record, bit by bit, based on the physical record order. If the table is ordered, then VFP has to figure out where in the table a bit (that represents a record) is relative to the current index.