Set up the network once, then join each new till or computer with a code. A till on the network without the code does not join.
4 things it does
Your tills need no firewall settings typed in by hand
When SellyPOS is installed, the installer sets up the firewall rules that the shop network needs. You do not open the firewall settings or type anything into them. A second till can then pair with the first one. This applies to the copy of SellyPOS that the installer put on the computer.
Professional only
A new till joins your shop when you give it a code
The code runs out after a few minutes and works only once, so ask for a new one if it has run out.
A new till joins your shop with a code shown on a till that is already in it.Professional only
Connect a second computer with a code from your Master PC
On the second computer, choose the Master PC from the list of computers heard on the network. Type the six-character code shown on the Master PC's Network page. The second computer checks the Master PC's licence itself, then joins. The shop's name, users and settings are copied from the Master PC, and the second computer needs no licence of its own.
Professional only
Your staff use their usual passwords and PINs on a second computer
You do not set up a second set for it. Its payment choices are the ones SellyPOS ships with.