>I use free tables
>
>There is no corruption when I run the application in the server,
>but tables become often corrupted when I run the same application over the network
>
>Is there a suitable way to arranje code, to minimize data corruption while in a network?
>
>I already set autosave as ON, assing flush after every INSERT command, and still that table
>become corrupted, because Windows it says could not save the file do disk
>
>Can be dataenviroment cursors being the cause ?

Not sure what is causing your problem. Have you verified that all tables are closed cleanly and your users exit your app the appropriate way every time? Do you cleanly close all tables at every possible exit of your app? No power outages or network disconnects occurring? I recommend you look at SDT to repair the tables on the fly from inside your app:

http://www.stonefield.com/sdt.aspx