There's no such function.
You could use a script that runs when the file open's to log the account name in a table and a second script to log them out when the file closes. A list of the logged in records would be close to what you want, but if a person gets disconnected, they won't be logged out and this can affect the accuracy of your "log".
Yes, it is what I do now. And I would like to see any other feature I can use. Thank you.