>i put my tables in the network, which have security permissions per type of user.
>
>when i try to log in with a user who is not permitted to write to the file, i get error cannot update the cursor.
>
>how can i trap this? pls help. TIA.

If it's VFP8, one way to do this would be to wrap the writing operations into TRY... CATCH structure and trap for corresponding errors.
If the user has no permission to write to the folder, it is possible to place just one check when user logs in. In TRY... CATCH structure try to create the text file in the data folder. If the attempt fails, then the user has no required permissions. Of course the actual implemetation depend on what kind of permissions your user groups have.