Bentley's Tom Anderson writes:

SELECT subscriber entitlement of pooled usage of Bentley desktop applications is defined in the Bentley SELECT Agreement.

For pooled applications, SELECT Server tracks usage by machine and reports usage based on 1-hour intervals. Iterative sessions (any version) of the same application (i.e., MicroStation) on the same machine in the same calendar hour do not result in more than one usage, when compiled by SELECT Server.