Network licenses may have an unlimited number of End Users listed in Zemax, though the software will allow concurrent users up to the number of licensed seats. For example, a 10-seat network license may have 20 End Users, but only 10 of those people may run the software at any moment.
Individual licenses may have one End User at any time. This person may be the same as or different from the License Administrator. For subscription licenses, the End User may be reassigned one time per 30 day period.