If you keep your runtime dlls in the app directory you could use sys(2004). Just a though and it might not even be worth 2 pennies.
Einar

>Txs for all the answers
>
>but how can i check if the table is opened from vfp or from my application.in short how can i identify in which environment am i in, dev or prod ?
>
>Txs
>
>>Check out the database events. You can put code in the DBC that will only allow tables to be opend if a certian condition exists, such as a global variable you create and initialize at the beginning of your program.
>>
>>>Hello all
>>>
>>>How can i restrict the user from getting to the database from foxpro,i want them to use the application to make any changes.
>>>
>>>txs