How do I stop more than one user opening the same file?

I'm about to install Lion Server and we're concerned that more than one person will be able to open the same file at the same time. Can this be prevented? If not it seems to make the concept of a server pointless?
Any help appreciated. Already annoyed I have to phone and order 10.7 Server as it's no longer on the App Store. Can't run 10.8 as the Mac Pro is too old and Apple have cut us off.

The file server software supports file locking, but multiple file access is application-dependent. In some cases it's entirely valid for multiple users to access the same file. It's up to the application to allow or deny this.
Ordinarily, if an application requires exclusive access it should flag the file accordingly when it opens the file. This will prevent other users from opening the file. However, it's not up to the server to do this.

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