This is likely capturing the session mbeans via jmx. Not specific to windchill but servlet stuff can be googled. Quickest approach will probably involve dissecting that jsp to figure out the key for tracking server sessions.
In Windchill one can capture and log any JMX MBean attribute value on a scheduled basis via creation/configuration of a Summary MBean.
The case in question involves the TotalActiveUserCount attribute of the MBean with ObjectName "com.ptc:wt.subsystem=Monitors,Name=ActiveUsers" /in the server manager/.
In X-20 this (along with most other items in the server status page) is logged to the database and charted for you out-of-the-box.
In R9.1 M050 the same database logging capability (AsyncJDBCAppender) is present -- and thus configuring a Summary logger to log to an appropriate AsyncJDBCAppender is possible given sufficient time/effort.
-- Jess Holle
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