Many thanks, Jim. I'll file this away for future reference. I'm bound to be stung by this one.

>In some simple testing it seems to use the CDX on disk and not the buffer. I just made a form with a table with one tag. Put a textbox in the form and an append button. Another button did the indexseek() and displayed the result in a wait window such that it seeked the value in the textbox and showed On disk if there was no hit and In memory if there was a hit.
>
>It showed ON disk for all new values and in memory for the values that were already in the table from the previous run.