In a structure with a Terminal / Server architecture it is possible to realize the Floating structure.
The basic license provides the software and the database for installation on the server, and the access right for a user. The access of each user is possible from any device connected to the network. Access is personal and linked to the ID and Password. You can add to the same login other users who can access in a non-contemporary way.
You can add N additional licenses, which can be used with the same criterion, then from shared users or from single users. One of the advantages of this structure is that access to the server, with appropriate technology settings, can also be performed from outside the company, and also from non-PC devices (eg Mac).