Multiple apps using same files, how to lock them?

Hi all,
I have a unique situation (or so I think). We are running our apps in Citrix servers, such that many users log in to a single citrix server and run our java apps. The problem is, it will be possible that more than one user might use the same app and start to work with the same file.
I have seen the new NIO package, read that it has better file locking and stuff. I guess what I am after is a way to graphically display the user using a given file, with some other features. Basically, if user 1 runs the app, and clicks on a file, they have sole access to it. Now, if user 2 runs the same app, what I would like to see if I can do is in user 2's view of the file system, they see somethine like:
xxxx.txt
yyyy.xml (user1)
zzz.bat
So, somehow, I want to update the JList view of each users view either every so often, or when they click on a file that is being used by another, to let them know that it is locked AND the user who has locked it. This way, they can at least ask that user if they can "unlock" their use of it.
Ideally, if there is some way for two or more copies of the same program (running on the same or different citrix servers) could communicate with one another to constantly update each other of file lock status, that would be great. However, if this is more complex than a few hundred lines, it is a rare occassion that this will happen so it is not worth the effot. Mainly, I need to minimally make sure that if a file is locked by one user, when another user tries to use it they are notified that it is locked.
Thanks.

How about doing file maangement through your server? Keep a database of what files are checked out by whom

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