The salespersons won’t be payable users as long as they don’t log in as cashier(front end) or login to the backend. Timecard (employee time tracking) feature won’t count as a payable user either.
If you pay $99 per computer, the user is unlimited. Here’s the example:
If one user and one computer, it will be $39.
If two users and one computer, it will be 39X2=78.
If one user and two computers, it will be 39X2=78.
If 3 or more users and one computer, it will be $99.