>>Exactly how does your semaphore technique work? How does it
>>handle a person that opens a record and just leaves? How do
>>you handle the user that opens a record and instead of exiting
>>the program in the proper sequence just turns off his machine
>>leaving that record open?
>
>Because a semaphore does not represent a true locking, those situations will not represent a problem as long as we combine this with a timestamp and allow a certain time to update.

Do you have a way of detecting wether a user is still on the network or not?

Dan