Hi, I found a similiar discussion. I hope this helps
Sergio
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Subject: RE: Count concurrent users
It will depend on whether the web/app server provides those metrics.
From the app server, we tend to get those from JMX or WMI/PerfMon. Apache-based web servers will provide that info in the extended info stats page, while IIS provides them via WMI/PerfMon.
Haruhiko Davis