Saving data in same table simultaneously

Hi All
I have a question and here it goes. Suppose I have two users who are updating the same table through forms and Saving or commiting at the same time, exactly same time. What will happen in this kind of situation. Both of them will get error or one will get and the other will be able to commit or both will commit. Though i am quite sure that both cant commit at the same time. So my question to all is what will happen in this kind of a situation and what can i do to avoid this kind of situation. I have heard something about On-Lock trigger. Does this comes into picture during this situation.
Any kind of suggestion is appreciated. Thanks in advance.

Thanks Francois
<<<You can delay this locking process to the commit time.>>>
1. I am sorry but i couldnt figure out what you mean by this.
2. Also if suppose i overload the ON-LOCK trigger, i will writing a code to throw an error msg to both the users and ask them to try later.
3. By the way, is there a way by which i can just randomly select one of the user to have commit first and then process commit for the second one.
Please advise. Thanks for the help.

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Whenver you have a question, it helps to post:
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(2) A little sample data (just enough to show what the problem is) from all the relevant tables
(3) The results you want from that data
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>
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