Rich,

I just did some experimenting, and now I don't know what to believe!
Here's what I did:

1) Open two VFP 5.0 sessions on the same machine.
2) SET EXCLUSIVE OFF, on both.
3) USE MyTable, in both sessions (same table used).
4) In one session, do an INDEX ON Expr TAG Expr - no problem.
5) In the other session, table is still modifiable. Try SET ORDER TO Expr - error: 'Table has no index order set'. Close this table with USE and try to re-open - error: 'File access denied'.

It's like the table went from SHARED TO EXCLUSIVE use in the first session, because of the INDEX command!

Do you know anything about this? Maybe this is similar to Brenda's problem.
TIA!
Mark