>>>Using FAQ #7896, by Ramon F. Jaquez, I can now find out which user has opened a certain file. Now, I would like to know which user have it open exclusive and which shared - but I don't see such an option in this download. Is it possible to get this information?
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>>If you can't open the file yourself (issue some command with error trap) then it's exclusive, if you can then it's shared.
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>Sure. But: In my system, there is apparently some rogue process that keeps the file open exclusively, and I don't know which process it is, or which user is using it. So the question is not, did someone use it exclusively, but rather, who. I hope this will help me track down the error.
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>FAQ #7896 tells me who is using some file, but not, whether it is exclusive.

We had such problems before in my former job place. Once the file got locked, only re-booting the computer in question released this lock.