2003 Excel
 

I have a spread sheet we are using to control and maintain work order
numbers. It is currently on a shared drive on are server. We want multiple
people have to add to this spread sheet and maintain it. What I am wanting to
do is have it so if someone is currently in the spreed sheet editing it other
people can only view it but not edit it until that person is done.
Does anyone know how to set up this feature? I have seen it done before but
cannot remember how to set it up.

Thank You for any help you can provided