To see all the users connected to your Domino server, you could always use the 'show users' or the administration client, on the status tab, to see who is connected to your server. But, what you don't see, is users accessing the server with a browser.
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To check this out, use the 'netstat -a' on the nt-server (also unix) and you can see every connection on port 80, or whatever portnumber used for Web.