Nadya:

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Suppose, I have a table open shared. I want to open it shared at another user station. How can I check, what this table is not opened exclusively already? Fopen() always returns -1 regardless of the second parameter. Do I really need to use Error Handler here or there is another way?
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Why not write a custom class wrapper for the use command and trap the error there? For example, the class could have an Exclusive property and a Use method. If Use raises an error code 3 when Exclusive is False, you then know the file is used exclusively by another user.

Daniel