Sounds like Dan has got you going in the right direction. First problem to solve is that you must stop the user from turning off the pc.

>Sometimes, when the user turn off the pc with the program opened the CDX file was broken. Then the Primary Key doesn't function and I have not unique keys. In this case I can't use the REINDEX command because the CDX is broken, and I can't use the INDEX command because I can't create a PRIMARY KEY with this instruction. What can I do ? Now I work with the pc, and use the Validate Database and re-make all the index in a manual way. Can I make a rutine to repair a CDX broken which has a Primary Key ?
>Thanks.