To see a report on the collective user count for all realtime servers, select the Realtime User Count tab from the Reports page.

The Realtime User Count report includes a table and graph that show the number of Concurrent Hosts and Total Users on all realtime servers:

Note: The Total Users count can be used to determine the number of users you are currently monitoring for License Statistics licensing. A "user" is defined as a unique username (a "user" could be a person or a machine) accessing the monitored applications. If one user accesses a monitored application from two hosts at one time, that user will count as two users.