Thank you Dmitry.

>Hi Denis,
>
>I usually deal with this situation by semaphore lock. That is, when a form is being loaded, the code locks a semaphore. And until the semaphore is unlocked, any other user will not be able to load this form; and get a message accordingly.
>
>HTH
>
>>Hello all,
>>
>>I have a form where two tables will have to be locked. it's a multi-users app.
>>
>>I am afraid that if two users get into that form, one could have a lock on table #1 and for whatever reason, the other user could have the lock on the second table.
>>
>>How can I make sure that when a given user gets one table locked he will also get the lock on the second table?
>>
>>I'm thinking about creating a table where one field would serve to tell me when a locked was made.
>>
>>so if field in controlling table tells me that nothing is locked I replace value with .T. so now I know I can lock the second table.
>>
>>And other user can't lock until user #1 is finished doing is things.
>>
>>?