Locking Issues/Release in Forms 10g R2

Hi all,
We are using 10g R2 AS and oracle database 10g.
Give me a good solution to prevent locking. User A is accessing one form(using execute_query, form built-in insert_record etc) and he is not coming out of the form for a long time. In this case, User B, C , D..are trying and they have to wait in the queue. In this case, we are forcefully killing user A session.Suppose his changes are not saved ie he might have entered inter-linked information in form 1,2, and working on 3. That time we are killing his session because of other users queues.
So in this case , we cannot communitcate with each user(users are plenty) to come out of the screen. Better to introduce time-out in forms level. Can you please give an idea to overcome this problem...?I have no knowledge in lock handling.
Regards
Priya

Steve,
Thanks for your reply.
Actually, I will explain the situation like this. Form is locking the record properly. But the users are not using it properly.Like, User A is inter-related forms a1,a2,a3etc. In a2 form, he is feeding some information and not committing his changes. Just opened the screen idle for long time. This time User B is coming and doing some changes/inserts in a1 and trying to access a2...Here he will be in queue bcoz of User A. User C , D , E are coming and same situation.
So manually, we are killing the process to avoid further delays for users b,c,d etc.
After some time, user A is coming to us stating that he has made some changes and it has not been committed. Of course, this is the correct behaviour of forms in locking. But since we are killing, the changes are not committed.
We can do two things(according to me)
1. Educating the user to come out of the form (User is not understanding..this is the manufacturing unit they know just to type and click. And they don't want to understand system problems)
--it is impossible
2. Time-out of the forms....
Is point2 feasible? Or is there any good ideas??
Priya

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