This article explains the difference between a Server and a Client workstation, where Point of Sale can run in Single User mode (one workstation) or Multi User mode (up to 20 networked workstations). It also includes steps on how to change a workstation number in a multi- user setup.
The most powerful computer should be the Server Workstation and holds the company data file with up to nineteen Client Workstations connecting to the server.
A separate user license (or seat) must be purchased for each workstation requiring simultaneous access.
Within a store, Point of Sale can be run in Single User Mode (one workstation) or Multi User Mode (up to 20 networked workstations).
You may need to change this setting if you are adding or removing workstations in the future.